664560335370620 has 96 divisors (see below), whose sum is σ = 1503495785792448. Its totient is φ = 245283564367872.

The previous prime is 664560335370619. The next prime is 664560335370623. The reversal of 664560335370620 is 26073533065466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664560335370623) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9126408452 + ... + 9126481268.

It is an arithmetic number, because the mean of its divisors is an integer number (15661414435338).

Almost surely, 2^{664560335370620} is an apocalyptic number.

It is an amenable number.

664560335370620 is an abundant number, since it is smaller than the sum of its proper divisors (838935450421828).

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

664560335370620 is a wasteful number, since it uses less digits than its factorization.

664560335370620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85599 (or 85597 counting only the distinct ones).

The product of its (nonzero) digits is 48988800, while the sum is 56.

The spelling of 664560335370620 in words is "six hundred sixty-four trillion, five hundred sixty billion, three hundred thirty-five million, three hundred seventy thousand, six hundred twenty".