664860876871 has 8 divisors (see below), whose sum is σ = 667474132320. Its totient is φ = 662247825408.

The previous prime is 664860876821. The next prime is 664860876923. The reversal of 664860876871 is 178678068466.

664860876871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 664860876871 - 2¹⁵ = 664860844103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664860876797 and 664860876806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664860876821) 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, 12857350 + ... + 12908956.

It is an arithmetic number, because the mean of its divisors is an integer number (83434266540).

Almost surely, 2^664860876871 is an apocalyptic number.

664860876871 is a deficient number, since it is larger than the sum of its proper divisors (2613255449).

664860876871 is a wasteful number, since it uses less digits than its factorization.

664860876871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101993.

The product of its (nonzero) digits is 130056192, while the sum is 67.

The spelling of 664860876871 in words is "six hundred sixty-four billion, eight hundred sixty million, eight hundred seventy-six thousand, eight hundred seventy-one".