664560746764 has 24 divisors (see below), whose sum is σ = 1200576247808. Its totient is φ = 321540379920.

The previous prime is 664560746749. The next prime is 664560746767. The reversal of 664560746764 is 467647065466.

It is a super-2 number, since 2×664560746764² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (664560746767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1792699 + ... + 2131405.

Almost surely, 2^664560746764 is an apocalyptic number.

It is an amenable number.

664560746764 is a deficient number, since it is larger than the sum of its proper divisors (536015501044).

664560746764 is a wasteful number, since it uses less digits than its factorization.

664560746764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354565 (or 354563 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 61.

The spelling of 664560746764 in words is "six hundred sixty-four billion, five hundred sixty million, seven hundred forty-six thousand, seven hundred sixty-four".