102666565931 has 2 divisors, whose sum is σ = 102666565932. Its totient is φ = 102666565930.

The previous prime is 102666565927. The next prime is 102666565993. The reversal of 102666565931 is 139565666201.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 102666565931 - 2² = 102666565927 is a prime.

It is a super-4 number, since 4×102666565931⁴ (a number of 45 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 102666565931.

It is not a weakly prime, because it can be changed into another prime (102666565921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51333282965 + 51333282966.

It is an arithmetic number, because the mean of its divisors is an integer number (51333282966).

Almost surely, 2^102666565931 is an apocalyptic number.

102666565931 is a deficient number, since it is larger than the sum of its proper divisors (1).

102666565931 is an equidigital number, since it uses as much as digits as its factorization.

102666565931 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1749600, while the sum is 50.

The spelling of 102666565931 in words is "one hundred two billion, six hundred sixty-six million, five hundred sixty-five thousand, nine hundred thirty-one".