57326317721 has 4 divisors (see below), whose sum is σ = 57359398692. Its totient is φ = 57293236752.

The previous prime is 57326317717. The next prime is 57326317739. The reversal of 57326317721 is 12771362375.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13285098121 + 44041219600 = 115261^2 + 209860^2 .

It is a cyclic number.

It is not a de Polignac number, because 57326317721 - 2² = 57326317717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (57326317771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16537886 + ... + 16541351.

It is an arithmetic number, because the mean of its divisors is an integer number (14339849673).

Almost surely, 2^57326317721 is an apocalyptic number.

It is an amenable number.

57326317721 is a deficient number, since it is larger than the sum of its proper divisors (33080971).

57326317721 is a wasteful number, since it uses less digits than its factorization.

57326317721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33080970.

The product of its digits is 370440, while the sum is 44.

The spelling of 57326317721 in words is "fifty-seven billion, three hundred twenty-six million, three hundred seventeen thousand, seven hundred twenty-one".