642919527538 has 16 divisors (see below), whose sum is σ = 1002650100480. Its totient is φ = 308852031600.

The previous prime is 642919527479. The next prime is 642919527611. The reversal of 642919527538 is 835725919246.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37292353 + ... + 37309588.

It is an arithmetic number, because the mean of its divisors is an integer number (62665631280).

Almost surely, 2^642919527538 is an apocalyptic number.

642919527538 is a deficient number, since it is larger than the sum of its proper divisors (359730572942).

642919527538 is a wasteful number, since it uses less digits than its factorization.

642919527538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74602113.

The product of its digits is 32659200, while the sum is 61.

The spelling of 642919527538 in words is "six hundred forty-two billion, nine hundred nineteen million, five hundred twenty-seven thousand, five hundred thirty-eight".