664287686782466 has 16 divisors (see below), whose sum is σ = 999263872171584. Its totient is φ = 331201039753584.

The previous prime is 664287686782453. The next prime is 664287686782471.

664287686782466 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326575790 + ... + 328603593.

It is an arithmetic number, because the mean of its divisors is an integer number (62453992010724).

Almost surely, 2^{664287686782466} is an apocalyptic number.

664287686782466 is a deficient number, since it is larger than the sum of its proper divisors (334976185389118).

664287686782466 is a wasteful number, since it uses less digits than its factorization.

664287686782466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655180825.

The product of its digits is 74912366592, while the sum is 86.

The spelling of 664287686782466 in words is "six hundred sixty-four trillion, two hundred eighty-seven billion, six hundred eighty-six million, seven hundred eighty-two thousand, four hundred sixty-six".