64646492023188 has 18 divisors (see below), whose sum is σ = 163411965947594. Its totient is φ = 21548830674384.

The previous prime is 64646492023171. The next prime is 64646492023193. The reversal of 64646492023188 is 88132029464646.

It is a happy number.

64646492023188 is a `hidden beast` number, since 6 + 4 + 6 + 46 + 492 + 0 + 23 + 1 + 88 = 666.

It can be written as a sum of positive squares in only one way, i.e., 64589704179984 + 56787843204 = 8036772^2 + 238302^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 897867944731 + ... + 897867944802.

Almost surely, 2^{64646492023188} is an apocalyptic number.

It is an amenable number.

64646492023188 is an abundant number, since it is smaller than the sum of its proper divisors (98765473924406).

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

64646492023188 is a wasteful number, since it uses less digits than its factorization.

64646492023188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795735889543 (or 1795735889538 counting only the distinct ones).

The product of its (nonzero) digits is 95551488, while the sum is 63.

The spelling of 64646492023188 in words is "sixty-four trillion, six hundred forty-six billion, four hundred ninety-two million, twenty-three thousand, one hundred eighty-eight".