642805858957 has 8 divisors (see below), whose sum is σ = 645593547456. Its totient is φ = 640018417632.

The previous prime is 642805858913. The next prime is 642805858979. The reversal of 642805858957 is 759858508246.

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 642805858957 - 2¹¹ = 642805856909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642805858892 and 642805858901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642805858907) 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, 6790848 + ... + 6884854.

It is an arithmetic number, because the mean of its divisors is an integer number (80699193432).

Almost surely, 2^642805858957 is an apocalyptic number.

It is an amenable number.

642805858957 is a deficient number, since it is larger than the sum of its proper divisors (2787688499).

642805858957 is a wasteful number, since it uses less digits than its factorization.

642805858957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123587.

The product of its (nonzero) digits is 193536000, while the sum is 67.

The spelling of 642805858957 in words is "six hundred forty-two billion, eight hundred five million, eight hundred fifty-eight thousand, nine hundred fifty-seven".