664565016464260 has 48 divisors (see below), whose sum is σ = 1456397958153600. Its totient is φ = 254245001272064.

The previous prime is 664565016464207. The next prime is 664565016464287. The reversal of 664565016464260 is 62464610565466.

It is a happy number.

It is a super-2 number, since 2×664565016464260² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61328950 + ... + 71346829.

It is an arithmetic number, because the mean of its divisors is an integer number (30341624128200).

Almost surely, 2^{664565016464260} is an apocalyptic number.

It is an amenable number.

664565016464260 is an abundant number, since it is smaller than the sum of its proper divisors (791832941689340).

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

664565016464260 is a wasteful number, since it uses less digits than its factorization.

664565016464260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132686700 (or 132686698 counting only the distinct ones).

The product of its (nonzero) digits is 149299200, while the sum is 61.

The spelling of 664565016464260 in words is "six hundred sixty-four trillion, five hundred sixty-five billion, sixteen million, four hundred sixty-four thousand, two hundred sixty".