642721317562 has 32 divisors (see below), whose sum is σ = 994832487360. Its totient is φ = 311274247680.

The previous prime is 642721317551. The next prime is 642721317619. The reversal of 642721317562 is 265713127246.

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, 29554489 + ... + 29576227.

It is an arithmetic number, because the mean of its divisors is an integer number (31088515230).

Almost surely, 2^642721317562 is an apocalyptic number.

642721317562 is a deficient number, since it is larger than the sum of its proper divisors (352111169798).

642721317562 is a wasteful number, since it uses less digits than its factorization.

642721317562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25486.

The product of its digits is 846720, while the sum is 46.

The spelling of 642721317562 in words is "six hundred forty-two billion, seven hundred twenty-one million, three hundred seventeen thousand, five hundred sixty-two".