57171665772 has 144 divisors (see below), whose sum is σ = 160997010720. Its totient is φ = 16991990784.

The previous prime is 57171665767. The next prime is 57171665783. The reversal of 57171665772 is 27756617175.

57171665772 is a `hidden beast` number, since 5 + 7 + 1 + 7 + 1 + 66 + 577 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2395048 + ... + 2418800.

Almost surely, 2^57171665772 is an apocalyptic number.

57171665772 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57171665772, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80498505360).

57171665772 is an abundant number, since it is smaller than the sum of its proper divisors (103825344948).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57171665772 is a wasteful number, since it uses less digits than its factorization.

57171665772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23952 (or 23947 counting only the distinct ones).

The product of its digits is 4321800, while the sum is 54.

The spelling of 57171665772 in words is "fifty-seven billion, one hundred seventy-one million, six hundred sixty-five thousand, seven hundred seventy-two".