642512640018 has 32 divisors (see below), whose sum is σ = 1289219633856. Its totient is φ = 213471969728.

The previous prime is 642512639969. The next prime is 642512640037. The reversal of 642512640018 is 810046215246.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32501005 + ... + 32520767.

It is an arithmetic number, because the mean of its divisors is an integer number (40288113558).

Almost surely, 2^642512640018 is an apocalyptic number.

642512640018 is an abundant number, since it is smaller than the sum of its proper divisors (646706993838).

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

642512640018 is a wasteful number, since it uses less digits than its factorization.

642512640018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37178.

The product of its (nonzero) digits is 92160, while the sum is 39.

The spelling of 642512640018 in words is "six hundred forty-two billion, five hundred twelve million, six hundred forty thousand, eighteen".