57267745721 has 4 divisors (see below), whose sum is σ = 57270323700. Its totient is φ = 57265167744.

The previous prime is 57267745607. The next prime is 57267745727. The reversal of 57267745721 is 12754776275.

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 15595014400 + 41672731321 = 124880^2 + 204139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-57267745721 is a prime.

It is a super-2 number, since 2×57267745721² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57267745727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255376 + ... + 1300193.

It is an arithmetic number, because the mean of its divisors is an integer number (14317580925).

Almost surely, 2^57267745721 is an apocalyptic number.

It is an amenable number.

57267745721 is a deficient number, since it is larger than the sum of its proper divisors (2577979).

57267745721 is a wasteful number, since it uses less digits than its factorization.

57267745721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577978.

The product of its digits is 5762400, while the sum is 53.

The spelling of 57267745721 in words is "fifty-seven billion, two hundred sixty-seven million, seven hundred forty-five thousand, seven hundred twenty-one".