3634861801872 has 160 divisors (see below), whose sum is σ = 11660710174720. Its totient is φ = 952134497280.

The previous prime is 3634861801829. The next prime is 3634861801979. The reversal of 3634861801872 is 2781081684363.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8985493 + ... + 9381300.

It is an arithmetic number, because the mean of its divisors is an integer number (72879438592).

Almost surely, 2^{3634861801872} is an apocalyptic number.

It is an amenable number.

3634861801872 is an abundant number, since it is smaller than the sum of its proper divisors (8025848372848).

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

3634861801872 is a wasteful number, since it uses less digits than its factorization.

3634861801872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18366861 (or 18366855 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 57.

The spelling of 3634861801872 in words is "three trillion, six hundred thirty-four billion, eight hundred sixty-one million, eight hundred one thousand, eight hundred seventy-two".