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51000020450 = 2523190736277
BaseRepresentation
bin101111011111110101…
…101000110111100010
311212122021112110210022
4233133311220313202
51313422001123300
635232403233442
73453554010161
oct573765506742
9155567473708
1051000020450
111a6a1200235
129a73978882
134a69cb62c2
14267b4853d8
1514d757c285
hexbdfd68de2

51000020450 has 48 divisors (see below), whose sum is σ = 98030701824. Its totient is φ = 19719633600.

The previous prime is 51000020431. The next prime is 51000020453. The reversal of 51000020450 is 5402000015.

It is not an unprimeable number, because it can be changed into a prime (51000020453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1387712 + ... + 1423988.

It is an arithmetic number, because the mean of its divisors is an integer number (2042306288).

Almost surely, 251000020450 is an apocalyptic number.

51000020450 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51000020450 is a deficient number, since it is larger than the sum of its proper divisors (47030681374).

51000020450 is a wasteful number, since it uses less digits than its factorization.

51000020450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37227 (or 37222 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

Adding to 51000020450 its reverse (5402000015), we get a palindrome (56402020465).

The spelling of 51000020450 in words is "fifty-one billion, twenty thousand, four hundred fifty".

Divisors: 1 2 5 10 25 31 50 62 155 310 775 907 1550 1814 4535 9070 22675 28117 36277 45350 56234 72554 140585 181385 281170 362770 702925 906925 1124587 1405850 1813850 2249174 5622935 11245870 28114675 32903239 56229350 65806478 164516195 329032390 822580975 1020000409 1645161950 2040000818 5100002045 10200004090 25500010225 51000020450