51640916123 has 2 divisors, whose sum is σ = 51640916124. Its totient is φ = 51640916122.

The previous prime is 51640916113. The next prime is 51640916141. The reversal of 51640916123 is 32161904615.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51640916123 - 2²⁸ = 51372480667 is a prime.

It is a super-2 number, since 2×51640916123² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51640916113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25820458061 + 25820458062.

It is an arithmetic number, because the mean of its divisors is an integer number (25820458062).

Almost surely, 2^51640916123 is an apocalyptic number.

51640916123 is a deficient number, since it is larger than the sum of its proper divisors (1).

51640916123 is an equidigital number, since it uses as much as digits as its factorization.

51640916123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 51640916123 in words is "fifty-one billion, six hundred forty million, nine hundred sixteen thousand, one hundred twenty-three".