642999268835 has 16 divisors (see below), whose sum is σ = 961993711872. Its totient is φ = 400830712800.

The previous prime is 642999268799. The next prime is 642999268913. The reversal of 642999268835 is 538862999246.

It is not a de Polignac number, because 642999268835 - 2⁶ = 642999268771 is a prime.

It is a Duffinian 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, 835063601 + ... + 835064370.

It is an arithmetic number, because the mean of its divisors is an integer number (60124606992).

Almost surely, 2^642999268835 is an apocalyptic number.

642999268835 is a deficient number, since it is larger than the sum of its proper divisors (318994443037).

642999268835 is a wasteful number, since it uses less digits than its factorization.

642999268835 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670127994.

The product of its digits is 403107840, while the sum is 71.

The spelling of 642999268835 in words is "six hundred forty-two billion, nine hundred ninety-nine million, two hundred sixty-eight thousand, eight hundred thirty-five".