642855985295 has 8 divisors (see below), whose sum is σ = 771499810080. Its totient is φ = 514236369760.

The previous prime is 642855985273. The next prime is 642855985309. The reversal of 642855985295 is 592589558246.

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

It is not a de Polignac number, because 642855985295 - 2¹² = 642855981199 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, 5993840 + ... + 6100149.

It is an arithmetic number, because the mean of its divisors is an integer number (96437476260).

Almost surely, 2^642855985295 is an apocalyptic number.

642855985295 is a deficient number, since it is larger than the sum of its proper divisors (128643824785).

642855985295 is a wasteful number, since it uses less digits than its factorization.

642855985295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12104625.

The product of its digits is 311040000, while the sum is 68.

The spelling of 642855985295 in words is "six hundred forty-two billion, eight hundred fifty-five million, nine hundred eighty-five thousand, two hundred ninety-five".