57445521861 has 96 divisors (see below), whose sum is σ = 102391443840. Its totient is φ = 28311607296.

The previous prime is 57445521857. The next prime is 57445521877. The reversal of 57445521861 is 16812554475.

It is a happy number.

It is not a de Polignac number, because 57445521861 - 2² = 57445521857 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57445521861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57445521811) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2639721 + ... + 2661393.

It is an arithmetic number, because the mean of its divisors is an integer number (1066577540).

Almost surely, 2^57445521861 is an apocalyptic number.

It is an amenable number.

57445521861 is a deficient number, since it is larger than the sum of its proper divisors (44945921979).

57445521861 is a wasteful number, since it uses less digits than its factorization.

57445521861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21795 (or 21788 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 48.

The spelling of 57445521861 in words is "fifty-seven billion, four hundred forty-five million, five hundred twenty-one thousand, eight hundred sixty-one".