642798368215 has 8 divisors (see below), whose sum is σ = 773115124320. Its totient is φ = 513067306272.

The previous prime is 642798368207. The next prime is 642798368239. The reversal of 642798368215 is 512863897246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642798368215 - 2³ = 642798368207 is a prime.

It is a congruent number.

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, 146421124 + ... + 146425513.

It is an arithmetic number, because the mean of its divisors is an integer number (96639390540).

Almost surely, 2^642798368215 is an apocalyptic number.

642798368215 is a deficient number, since it is larger than the sum of its proper divisors (130316756105).

642798368215 is a wasteful number, since it uses less digits than its factorization.

642798368215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292847081.

The product of its digits is 34836480, while the sum is 61.

The spelling of 642798368215 in words is "six hundred forty-two billion, seven hundred ninety-eight million, three hundred sixty-eight thousand, two hundred fifteen".