57450816721 has 3 divisors (see below), whose sum is σ = 57451056411. Its totient is φ = 57450577032.

The previous prime is 57450816701. The next prime is 57450816739. The reversal of 57450816721 is 12761805475.

The square root of 57450816721 is 239689.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 51478618321 + 5972198400 = 226889^2 + 77280^2 .

It is not a de Polignac number, because 57450816721 - 2²⁷ = 57316598993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57450816701) 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 2 ways as a sum of consecutive naturals, for example, 119845 + ... + 359533.

It is an arithmetic number, because the mean of its divisors is an integer number (19150352137).

Almost surely, 2^57450816721 is an apocalyptic number.

57450816721 is the 239689-th square number.

57450816721 is the 119845-th centered octagonal number.

It is an amenable number.

57450816721 is a deficient number, since it is larger than the sum of its proper divisors (239690).

57450816721 is an frugal number, since it uses more digits than its factorization.

57450816721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479378 (or 239689 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 46.

The spelling of 57450816721 in words is "fifty-seven billion, four hundred fifty million, eight hundred sixteen thousand, seven hundred twenty-one".