57637681921 has 4 divisors (see below), whose sum is σ = 57638775744. Its totient is φ = 57636588100.

The previous prime is 57637681837. The next prime is 57637681939. The reversal of 57637681921 is 12918673675.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57637681921 - 2⁷ = 57637681793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57637681991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 463645 + ... + 574666.

It is an arithmetic number, because the mean of its divisors is an integer number (14409693936).

Almost surely, 2^57637681921 is an apocalyptic number.

It is an amenable number.

57637681921 is a deficient number, since it is larger than the sum of its proper divisors (1093823).

57637681921 is a wasteful number, since it uses less digits than its factorization.

57637681921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1093822.

The product of its digits is 3810240, while the sum is 55.

The spelling of 57637681921 in words is "fifty-seven billion, six hundred thirty-seven million, six hundred eighty-one thousand, nine hundred twenty-one".