642312195564 has 192 divisors, whose sum is σ = 1710926938112. Its totient is φ = 186176102400.

The previous prime is 642312195523. The next prime is 642312195607. The reversal of 642312195564 is 465591213246.

642312195564 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 28603389 + ... + 28625835.

Almost surely, 2^642312195564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 642312195564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (855463469056).

642312195564 is an abundant number, since it is smaller than the sum of its proper divisors (1068614742548).

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

642312195564 is a wasteful number, since it uses less digits than its factorization.

642312195564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22656 (or 22654 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 48.

The spelling of 642312195564 in words is "six hundred forty-two billion, three hundred twelve million, one hundred ninety-five thousand, five hundred sixty-four".