57978721173 has 4 divisors (see below), whose sum is σ = 77304961568. Its totient is φ = 38652480780.

The previous prime is 57978721169. The next prime is 57978721181. The reversal of 57978721173 is 37112787975.

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 not a de Polignac number, because 57978721173 - 2² = 57978721169 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57978721133) 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, 9663120193 + ... + 9663120198.

It is an arithmetic number, because the mean of its divisors is an integer number (19326240392).

Almost surely, 2^57978721173 is an apocalyptic number.

It is an amenable number.

57978721173 is a deficient number, since it is larger than the sum of its proper divisors (19326240395).

57978721173 is a wasteful number, since it uses less digits than its factorization.

57978721173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19326240394.

The product of its digits is 5186160, while the sum is 57.

The spelling of 57978721173 in words is "fifty-seven billion, nine hundred seventy-eight million, seven hundred twenty-one thousand, one hundred seventy-three".