57778315721 has 16 divisors (see below), whose sum is σ = 66949516800. Its totient is φ = 48836659968.

The previous prime is 57778315717. The next prime is 57778315757. The reversal of 57778315721 is 12751387775.

It is a cyclic number.

It is not a de Polignac number, because 57778315721 - 2² = 57778315717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57778317721) 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, 5190800 + ... + 5201918.

It is an arithmetic number, because the mean of its divisors is an integer number (4184344800).

Almost surely, 2^57778315721 is an apocalyptic number.

It is an amenable number.

57778315721 is a deficient number, since it is larger than the sum of its proper divisors (9171201079).

57778315721 is a wasteful number, since it uses less digits than its factorization.

57778315721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21368.

The product of its digits is 2881200, while the sum is 53.

The spelling of 57778315721 in words is "fifty-seven billion, seven hundred seventy-eight million, three hundred fifteen thousand, seven hundred twenty-one".