56521201157 has 2 divisors, whose sum is σ = 56521201158. Its totient is φ = 56521201156.

The previous prime is 56521201133. The next prime is 56521201169. The reversal of 56521201157 is 75110212565.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41433009601 + 15088191556 = 203551^2 + 122834^2 .

It is a cyclic number.

It is not a de Polignac number, because 56521201157 - 2²⁰ = 56520152581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56521201657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28260600578 + 28260600579.

It is an arithmetic number, because the mean of its divisors is an integer number (28260600579).

Almost surely, 2^56521201157 is an apocalyptic number.

It is an amenable number.

56521201157 is a deficient number, since it is larger than the sum of its proper divisors (1).

56521201157 is an equidigital number, since it uses as much as digits as its factorization.

56521201157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 35.

The spelling of 56521201157 in words is "fifty-six billion, five hundred twenty-one million, two hundred one thousand, one hundred fifty-seven".