664567560740720 has 160 divisors (see below), whose sum is σ = 1904217855590400. Its totient is φ = 210044617344000.

The previous prime is 664567560740683. The next prime is 664567560740737. The reversal of 664567560740720 is 27047065765466.

It is a super-2 number, since 2×664567560740720² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55309520 + ... + 66244079.

It is an arithmetic number, because the mean of its divisors is an integer number (11901361597440).

Almost surely, 2^{664567560740720} is an apocalyptic number.

It is an amenable number.

664567560740720 is an abundant number, since it is smaller than the sum of its proper divisors (1239650294849680).

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

664567560740720 is a wasteful number, since it uses less digits than its factorization.

664567560740720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121554383 (or 121554377 counting only the distinct ones).

The product of its (nonzero) digits is 355622400, while the sum is 65.

The spelling of 664567560740720 in words is "six hundred sixty-four trillion, five hundred sixty-seven billion, five hundred sixty million, seven hundred forty thousand, seven hundred twenty".