642518868236 has 96 divisors (see below), whose sum is σ = 1336688640000. Its totient is φ = 270068287104.

The previous prime is 642518868221. The next prime is 642518868259. The reversal of 642518868236 is 632868815246.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17910005 + ... + 17945843.

It is an arithmetic number, because the mean of its divisors is an integer number (13923840000).

Almost surely, 2^642518868236 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 642518868236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (668344320000).

642518868236 is an abundant number, since it is smaller than the sum of its proper divisors (694169771764).

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

642518868236 is a wasteful number, since it uses less digits than its factorization.

642518868236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36116 (or 36100 counting only the distinct ones).

The product of its digits is 26542080, while the sum is 59.

The spelling of 642518868236 in words is "six hundred forty-two billion, five hundred eighteen million, eight hundred sixty-eight thousand, two hundred thirty-six".