56773872521 has 2 divisors, whose sum is σ = 56773872522. Its totient is φ = 56773872520.

The previous prime is 56773872517. The next prime is 56773872523. The reversal of 56773872521 is 12527837765.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49022830921 + 7751041600 = 221411^2 + 88040^2 .

It is a cyclic number.

It is not a de Polignac number, because 56773872521 - 2² = 56773872517 is a prime.

Together with 56773872523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56773872523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28386936260 + 28386936261.

It is an arithmetic number, because the mean of its divisors is an integer number (28386936261).

Almost surely, 2^56773872521 is an apocalyptic number.

It is an amenable number.

56773872521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56773872521 is an equidigital number, since it uses as much as digits as its factorization.

56773872521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4939200, while the sum is 53.

The spelling of 56773872521 in words is "fifty-six billion, seven hundred seventy-three million, eight hundred seventy-two thousand, five hundred twenty-one".