1620557716164 has 24 divisors (see below), whose sum is σ = 3869238579360. Its totient is φ = 527623442304.

The previous prime is 1620557716117. The next prime is 1620557716171. The reversal of 1620557716164 is 4616177550261.

It is a super-2 number, since 2×1620557716164² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1570307349 + ... + 1570308380.

It is an arithmetic number, because the mean of its divisors is an integer number (161218274140).

Almost surely, 2^{1620557716164} is an apocalyptic number.

It is an amenable number.

1620557716164 is an abundant number, since it is smaller than the sum of its proper divisors (2248680863196).

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

1620557716164 is a wasteful number, since it uses less digits than its factorization.

1620557716164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140615779 (or 3140615777 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 51.

The spelling of 1620557716164 in words is "one trillion, six hundred twenty billion, five hundred fifty-seven million, seven hundred sixteen thousand, one hundred sixty-four".