642999268837 has 4 divisors (see below), whose sum is σ = 643158944896. Its totient is φ = 642839592780.

The previous prime is 642999268799. The next prime is 642999268913. The reversal of 642999268837 is 738862999246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642999268837 - 2²⁷ = 642865051109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642999268837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642999278837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79831989 + ... + 79840042.

It is an arithmetic number, because the mean of its divisors is an integer number (160789736224).

Almost surely, 2^642999268837 is an apocalyptic number.

It is an amenable number.

642999268837 is a deficient number, since it is larger than the sum of its proper divisors (159676059).

642999268837 is a wasteful number, since it uses less digits than its factorization.

642999268837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159676058.

The product of its digits is 564350976, while the sum is 73.

The spelling of 642999268837 in words is "six hundred forty-two billion, nine hundred ninety-nine million, two hundred sixty-eight thousand, eight hundred thirty-seven".