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51856801679 is a prime number
BaseRepresentation
bin110000010010111001…
…111111111110001111
311221211222201110200102
4300102321333332033
51322200320123204
635453411121315
73514026353504
oct602271777617
9157758643612
1051856801679
111aaa08a36a1
12a0728a323b
134b7565a047
14271d1914ab
1515378bd41e
hexc12e7ff8f

51856801679 has 2 divisors, whose sum is σ = 51856801680. Its totient is φ = 51856801678.

The previous prime is 51856801663. The next prime is 51856801723. The reversal of 51856801679 is 97610865815.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51856801679 - 24 = 51856801663 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51856803679) 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 as a sum of consecutive naturals, namely, 25928400839 + 25928400840.

It is an arithmetic number, because the mean of its divisors is an integer number (25928400840).

Almost surely, 251856801679 is an apocalyptic number.

51856801679 is a deficient number, since it is larger than the sum of its proper divisors (1).

51856801679 is an equidigital number, since it uses as much as digits as its factorization.

51856801679 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3628800, while the sum is 56.

The spelling of 51856801679 in words is "fifty-one billion, eight hundred fifty-six million, eight hundred one thousand, six hundred seventy-nine".