57881193721 has 4 divisors (see below), whose sum is σ = 62333593252. Its totient is φ = 53428794192.

The previous prime is 57881193707. The next prime is 57881193731. The reversal of 57881193721 is 12739118875.

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 3702114025 + 54179079696 = 60845^2 + 232764^2 .

It is a cyclic number.

It is not a de Polignac number, because 57881193721 - 2⁷ = 57881193593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57881193701) 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, 2226199746 + ... + 2226199771.

It is an arithmetic number, because the mean of its divisors is an integer number (15583398313).

Almost surely, 2^57881193721 is an apocalyptic number.

It is an amenable number.

57881193721 is a deficient number, since it is larger than the sum of its proper divisors (4452399531).

57881193721 is a wasteful number, since it uses less digits than its factorization.

57881193721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4452399530.

The product of its digits is 846720, while the sum is 52.

The spelling of 57881193721 in words is "fifty-seven billion, eight hundred eighty-one million, one hundred ninety-three thousand, seven hundred twenty-one".