72921008057 has 2 divisors, whose sum is σ = 72921008058. Its totient is φ = 72921008056.

The previous prime is 72921008047. The next prime is 72921008063. The reversal of 72921008057 is 75080012927.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70061325481 + 2859682576 = 264691^2 + 53476^2 .

It is a cyclic number.

It is not a de Polignac number, because 72921008057 - 2²⁰ = 72919959481 is a prime.

It is not a weakly prime, because it can be changed into another prime (72921008047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36460504028 + 36460504029.

It is an arithmetic number, because the mean of its divisors is an integer number (36460504029).

Almost surely, 2^72921008057 is an apocalyptic number.

It is an amenable number.

72921008057 is a deficient number, since it is larger than the sum of its proper divisors (1).

72921008057 is an equidigital number, since it uses as much as digits as its factorization.

72921008057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 41.

The spelling of 72921008057 in words is "seventy-two billion, nine hundred twenty-one million, eight thousand, fifty-seven".