642813259201 has 4 divisors (see below), whose sum is σ = 646756898992. Its totient is φ = 638869619412.

The previous prime is 642813259199. The next prime is 642813259223. The reversal of 642813259201 is 102952318246.

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 642813259201 - 2¹ = 642813259199 is a prime.

It is a super-2 number, since 2×642813259201² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642813259301) 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, 1971819651 + ... + 1971819976.

It is an arithmetic number, because the mean of its divisors is an integer number (161689224748).

Almost surely, 2^642813259201 is an apocalyptic number.

It is an amenable number.

642813259201 is a deficient number, since it is larger than the sum of its proper divisors (3943639791).

642813259201 is a wasteful number, since it uses less digits than its factorization.

642813259201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3943639790.

The product of its (nonzero) digits is 207360, while the sum is 43.

The spelling of 642813259201 in words is "six hundred forty-two billion, eight hundred thirteen million, two hundred fifty-nine thousand, two hundred one".