57145520520 has 128 divisors (see below), whose sum is σ = 207801936000. Its totient is φ = 13853456640.

The previous prime is 57145520507. The next prime is 57145520521. The reversal of 57145520520 is 2502554175.

57145520520 is a `hidden beast` number, since 5 + 71 + 45 + 5 + 20 + 520 = 666.

It is a super-2 number, since 2×57145520520² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (57145520521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2393235 + ... + 2416994.

It is an arithmetic number, because the mean of its divisors is an integer number (1623452625).

Almost surely, 2^57145520520 is an apocalyptic number.

It is an amenable number.

57145520520 is an abundant number, since it is smaller than the sum of its proper divisors (150656415480).

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

57145520520 is a wasteful number, since it uses less digits than its factorization.

57145520520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4810260 (or 4810250 counting only the distinct ones).

The product of its (nonzero) digits is 70000, while the sum is 36.

The spelling of 57145520520 in words is "fifty-seven billion, one hundred forty-five million, five hundred twenty thousand, five hundred twenty".