665167636874 has 32 divisors (see below), whose sum is σ = 1125181217664. Its totient is φ = 292614886080.

The previous prime is 665167636871. The next prime is 665167636879. The reversal of 665167636874 is 478636761566.

665167636874 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 665167636874.

It is not an unprimeable number, because it can be changed into a prime (665167636871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1795997 + ... + 2134464.

It is an arithmetic number, because the mean of its divisors is an integer number (35161913052).

Almost surely, 2^665167636874 is an apocalyptic number.

665167636874 is a deficient number, since it is larger than the sum of its proper divisors (460013580790).

665167636874 is a wasteful number, since it uses less digits than its factorization.

665167636874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3930782.

The product of its digits is 182891520, while the sum is 65.

The spelling of 665167636874 in words is "six hundred sixty-five billion, one hundred sixty-seven million, six hundred thirty-six thousand, eight hundred seventy-four".