57081216640 has 128 divisors (see below), whose sum is σ = 164162390400. Its totient is φ = 18540638208.

The previous prime is 57081216593. The next prime is 57081216649. The reversal of 57081216640 is 4661218075.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×57081216640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 57081216593 and 57081216602.

It is not an unprimeable number, because it can be changed into a prime (57081216649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250179 + ... + 420418.

It is an arithmetic number, because the mean of its divisors is an integer number (1282518675).

Almost surely, 2^57081216640 is an apocalyptic number.

It is an amenable number.

57081216640 is an abundant number, since it is smaller than the sum of its proper divisors (107081173760).

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

57081216640 is a wasteful number, since it uses less digits than its factorization.

57081216640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670642 (or 670630 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 57081216640 in words is "fifty-seven billion, eighty-one million, two hundred sixteen thousand, six hundred forty".