1644872061632 has 28 divisors (see below), whose sum is σ = 3456045528840. Its totient is φ = 774057440256.

The previous prime is 1644872061631. The next prime is 1644872061671. The reversal of 1644872061632 is 2361602784461.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1644872061631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755914382 + ... + 755916557.

Almost surely, 2^{1644872061632} is an apocalyptic number.

It is an amenable number.

1644872061632 is an abundant number, since it is smaller than the sum of its proper divisors (1811173467208).

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

1644872061632 is a wasteful number, since it uses less digits than its factorization.

1644872061632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1511830968 (or 1511830958 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 50.

The spelling of 1644872061632 in words is "one trillion, six hundred forty-four billion, eight hundred seventy-two million, sixty-one thousand, six hundred thirty-two".