642433811280 has 80 divisors (see below), whose sum is σ = 1994427449664. Its totient is φ = 171067714560.

The previous prime is 642433811273. The next prime is 642433811333. The reversal of 642433811280 is 82118334246.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1771069 + ... + 2102748.

Almost surely, 2^642433811280 is an apocalyptic number.

642433811280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642433811280 is an abundant number, since it is smaller than the sum of its proper divisors (1351993638384).

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

642433811280 is a wasteful number, since it uses less digits than its factorization.

642433811280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3874524 (or 3874518 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 42.

The spelling of 642433811280 in words is "six hundred forty-two billion, four hundred thirty-three million, eight hundred eleven thousand, two hundred eighty".