642635502102 has 48 divisors (see below), whose sum is σ = 1520807155920. Its totient is φ = 194500785600.

The previous prime is 642635502079. The next prime is 642635502107. The reversal of 642635502102 is 201205536246.

642635502102 is a `hidden beast` number, since 6 + 4 + 2 + 635 + 5 + 0 + 2 + 10 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642635502107) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1814077 + ... + 2139192.

It is an arithmetic number, because the mean of its divisors is an integer number (31683482415).

Almost surely, 2^642635502102 is an apocalyptic number.

642635502102 is an abundant number, since it is smaller than the sum of its proper divisors (878171653818).

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

642635502102 is a wasteful number, since it uses less digits than its factorization.

642635502102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954109 (or 3954106 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The spelling of 642635502102 in words is "six hundred forty-two billion, six hundred thirty-five million, five hundred two thousand, one hundred two".