1644872478988 has 12 divisors (see below), whose sum is σ = 2971382542912. Its totient is φ = 795906038160.

The previous prime is 1644872478943. The next prime is 1644872479001. The reversal of 1644872478988 is 8898742784461.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6632550195 + ... + 6632550442.

Almost surely, 2^{1644872478988} is an apocalyptic number.

It is an amenable number.

1644872478988 is a deficient number, since it is larger than the sum of its proper divisors (1326510063924).

1644872478988 is a wasteful number, since it uses less digits than its factorization.

1644872478988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13265100672 (or 13265100670 counting only the distinct ones).

The product of its digits is 1387266048, while the sum is 76.

The spelling of 1644872478988 in words is "one trillion, six hundred forty-four billion, eight hundred seventy-two million, four hundred seventy-eight thousand, nine hundred eighty-eight".