642887785379 has 8 divisors (see below), whose sum is σ = 735927481440. Its totient is φ = 550147735296.

The previous prime is 642887785373. The next prime is 642887785417. The reversal of 642887785379 is 973587788246.

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 642887785379 - 2²⁰ = 642886736803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642887785373) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74906894 + ... + 74915475.

It is an arithmetic number, because the mean of its divisors is an integer number (91990935180).

Almost surely, 2^642887785379 is an apocalyptic number.

642887785379 is a deficient number, since it is larger than the sum of its proper divisors (93039696061).

642887785379 is a wasteful number, since it uses less digits than its factorization.

642887785379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149822989.

The product of its digits is 1137991680, while the sum is 74.

The spelling of 642887785379 in words is "six hundred forty-two billion, eight hundred eighty-seven million, seven hundred eighty-five thousand, three hundred seventy-nine".