642757628863 has 8 divisors (see below), whose sum is σ = 734948743328. Its totient is φ = 550658663424.

The previous prime is 642757628837. The next prime is 642757628869. The reversal of 642757628863 is 368826757246.

It is a happy number.

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 642757628863 - 2⁹ = 642757628351 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642757628795 and 642757628804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642757628869) 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, 23022306 + ... + 23050207.

It is an arithmetic number, because the mean of its divisors is an integer number (91868592916).

Almost surely, 2^642757628863 is an apocalyptic number.

642757628863 is a deficient number, since it is larger than the sum of its proper divisors (92191114465).

642757628863 is a wasteful number, since it uses less digits than its factorization.

642757628863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46074513.

The product of its digits is 162570240, while the sum is 64.

The spelling of 642757628863 in words is "six hundred forty-two billion, seven hundred fifty-seven million, six hundred twenty-eight thousand, eight hundred sixty-three".