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, 2^51000020450 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".