76659005921 has 2 divisors, whose sum is σ = 76659005922. Its totient is φ = 76659005920.

The previous prime is 76659005909. The next prime is 76659005987. The reversal of 76659005921 is 12950095667.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62332112896 + 14326893025 = 249664^2 + 119695^2 .

It is a cyclic number.

It is not a de Polignac number, because 76659005921 - 2²² = 76654811617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 76659005921.

It is not a weakly prime, because it can be changed into another prime (76659005321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38329502960 + 38329502961.

It is an arithmetic number, because the mean of its divisors is an integer number (38329502961).

Almost surely, 2^76659005921 is an apocalyptic number.

It is an amenable number.

76659005921 is a deficient number, since it is larger than the sum of its proper divisors (1).

76659005921 is an equidigital number, since it uses as much as digits as its factorization.

76659005921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1020600, while the sum is 50.

The spelling of 76659005921 in words is "seventy-six billion, six hundred fifty-nine million, five thousand, nine hundred twenty-one".