663669973632 has 32 divisors (see below), whose sum is σ = 1762873368480. Its totient is φ = 221223324416.

The previous prime is 663669973601. The next prime is 663669973633. The reversal of 663669973632 is 236379966366.

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

It is not an unprimeable number, because it can be changed into a prime (663669973633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 864153228 + ... + 864153995.

It is an arithmetic number, because the mean of its divisors is an integer number (55089792765).

Almost surely, 2^663669973632 is an apocalyptic number.

It is an amenable number.

663669973632 is an abundant number, since it is smaller than the sum of its proper divisors (1099203394848).

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

663669973632 is a wasteful number, since it uses less digits than its factorization.

663669973632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1728307240 (or 1728307228 counting only the distinct ones).

The product of its digits is 238085568, while the sum is 66.

The spelling of 663669973632 in words is "six hundred sixty-three billion, six hundred sixty-nine million, nine hundred seventy-three thousand, six hundred thirty-two".