642634604213 has 32 divisors (see below), whose sum is σ = 761399181312. Its totient is φ = 530765654400.

The previous prime is 642634604207. The next prime is 642634604257. The reversal of 642634604213 is 312406436246.

It is a cyclic number.

It is not a de Polignac number, because 642634604213 - 2¹⁸ = 642634342069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642634604113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 157777145 + ... + 157781217.

It is an arithmetic number, because the mean of its divisors is an integer number (23793724416).

Almost surely, 2^642634604213 is an apocalyptic number.

It is an amenable number.

642634604213 is a deficient number, since it is larger than the sum of its proper divisors (118764577099).

642634604213 is a wasteful number, since it uses less digits than its factorization.

642634604213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065.

The product of its (nonzero) digits is 497664, while the sum is 41.

The spelling of 642634604213 in words is "six hundred forty-two billion, six hundred thirty-four million, six hundred four thousand, two hundred thirteen".