51356356399 has 2 divisors, whose sum is σ = 51356356400. Its totient is φ = 51356356398.

The previous prime is 51356356379. The next prime is 51356356439. The reversal of 51356356399 is 99365365315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51356356399 - 2²¹ = 51354259247 is a prime.

It is a super-2 number, since 2×51356356399² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51356356339) 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, 25678178199 + 25678178200.

It is an arithmetic number, because the mean of its divisors is an integer number (25678178200).

Almost surely, 2^51356356399 is an apocalyptic number.

51356356399 is a deficient number, since it is larger than the sum of its proper divisors (1).

51356356399 is an equidigital number, since it uses as much as digits as its factorization.

51356356399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9841500, while the sum is 55.

The spelling of 51356356399 in words is "fifty-one billion, three hundred fifty-six million, three hundred fifty-six thousand, three hundred ninety-nine".