664472545664 has 32 divisors (see below), whose sum is σ = 1323908153400. Its totient is φ = 332197558272.

The previous prime is 664472545621. The next prime is 664472545669. The reversal of 664472545664 is 466545274466.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664472545669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816392 + ... + 1412600.

Almost surely, 2^664472545664 is an apocalyptic number.

664472545664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664472545664 is a deficient number, since it is larger than the sum of its proper divisors (659435607736).

664472545664 is an equidigital number, since it uses as much as digits as its factorization.

664472545664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604930 (or 604918 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 59.

The spelling of 664472545664 in words is "six hundred sixty-four billion, four hundred seventy-two million, five hundred forty-five thousand, six hundred sixty-four".