642027855120 has 40 divisors (see below), whose sum is σ = 1990286351616. Its totient is φ = 171207427968.

The previous prime is 642027855109. The next prime is 642027855173. The reversal of 642027855120 is 21558720246.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1337557792 + ... + 1337558271.

Almost surely, 2^642027855120 is an apocalyptic number.

642027855120 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642027855120 is an abundant number, since it is smaller than the sum of its proper divisors (1348258496496).

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

642027855120 is a wasteful number, since it uses less digits than its factorization.

642027855120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2675116079 (or 2675116073 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 42.

The spelling of 642027855120 in words is "six hundred forty-two billion, twenty-seven million, eight hundred fifty-five thousand, one hundred twenty".