18644605535952 has 160 divisors (see below), whose sum is σ = 61454840448000. Its totient is φ = 5352518309760.

The previous prime is 18644605535909. The next prime is 18644605535953. The reversal of 18644605535952 is 25953550644681.

18644605535952 is a `hidden beast` number, since 1 + 8 + 6 + 4 + 4 + 6 + 0 + 5 + 535 + 95 + 2 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18644605535952.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18644605535953) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103160452 + ... + 103341027.

It is an arithmetic number, because the mean of its divisors is an integer number (384092752800).

Almost surely, 2^{18644605535952} is an apocalyptic number.

18644605535952 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18644605535952 is an abundant number, since it is smaller than the sum of its proper divisors (42810234912048).

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

18644605535952 is a wasteful number, since it uses less digits than its factorization.

18644605535952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206501526 (or 206501514 counting only the distinct ones).

The product of its (nonzero) digits is 155520000, while the sum is 63.

The spelling of 18644605535952 in words is "eighteen trillion, six hundred forty-four billion, six hundred five million, five hundred thirty-five thousand, nine hundred fifty-two".