664562641644 has 48 divisors (see below), whose sum is σ = 1879571111040. Its totient is φ = 201382618320.

The previous prime is 664562641643. The next prime is 664562641657. The reversal of 664562641644 is 446146265466.

664562641644 is a `hidden beast` number, since 6 + 6 + 4 + 5 + 626 + 4 + 1 + 6 + 4 + 4 = 666.

664562641644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (664562641643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 279696894 + ... + 279699269.

It is an arithmetic number, because the mean of its divisors is an integer number (39157731480).

Almost surely, 2^664562641644 is an apocalyptic number.

It is an amenable number.

664562641644 is an abundant number, since it is smaller than the sum of its proper divisors (1215008469396).

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

664562641644 is a wasteful number, since it uses less digits than its factorization.

664562641644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559396187 (or 559396179 counting only the distinct ones).

The product of its digits is 19906560, while the sum is 54.

The spelling of 664562641644 in words is "six hundred sixty-four billion, five hundred sixty-two million, six hundred forty-one thousand, six hundred forty-four".