664260206620 has 24 divisors (see below), whose sum is σ = 1395280568304. Its totient is φ = 265640438016.

The previous prime is 664260206611. The next prime is 664260206641. The reversal of 664260206620 is 26602062466.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3892162 + ... + 4059241.

It is an arithmetic number, because the mean of its divisors is an integer number (58136690346).

Almost surely, 2^664260206620 is an apocalyptic number.

It is an amenable number.

664260206620 is an abundant number, since it is smaller than the sum of its proper divisors (731020361684).

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

664260206620 is a wasteful number, since it uses less digits than its factorization.

664260206620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7955589 (or 7955587 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 40.

The spelling of 664260206620 in words is "six hundred sixty-four billion, two hundred sixty million, two hundred six thousand, six hundred twenty".