642644455220 has 48 divisors (see below), whose sum is σ = 1458976632960. Its totient is φ = 236946570624.

The previous prime is 642644455217. The next prime is 642644455231. The reversal of 642644455220 is 22554446246.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22839584 + ... + 22867703.

It is an arithmetic number, because the mean of its divisors is an integer number (30395346520).

Almost surely, 2^642644455220 is an apocalyptic number.

It is an amenable number.

642644455220 is an abundant number, since it is smaller than the sum of its proper divisors (816332177740).

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

642644455220 is a wasteful number, since it uses less digits than its factorization.

642644455220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45707352 (or 45707350 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 44.

The spelling of 642644455220 in words is "six hundred forty-two billion, six hundred forty-four million, four hundred fifty-five thousand, two hundred twenty".