642701042865 has 24 divisors (see below), whose sum is σ = 1273160161728. Its totient is φ = 293806190880.

The previous prime is 642701042827. The next prime is 642701042923. The reversal of 642701042865 is 568240107246.

It is not a de Polignac number, because 642701042865 - 2⁸ = 642701042609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 642701042865.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1020160071 + ... + 1020160700.

It is an arithmetic number, because the mean of its divisors is an integer number (53048340072).

Almost surely, 2^642701042865 is an apocalyptic number.

It is an amenable number.

642701042865 is a deficient number, since it is larger than the sum of its proper divisors (630459118863).

642701042865 is a wasteful number, since it uses less digits than its factorization.

642701042865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040320789 (or 2040320786 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 45.

The spelling of 642701042865 in words is "six hundred forty-two billion, seven hundred one million, forty-two thousand, eight hundred sixty-five".