665234686432566 has 12 divisors (see below), whose sum is σ = 1441341820603932. Its totient is φ = 221744895477516.

The previous prime is 665234686432529. The next prime is 665234686432583.

665234686432566 is a `hidden beast` number, since 6 + 6 + 5 + 23 + 4 + 6 + 8 + 6 + 4 + 32 + 566 = 666.

665234686432566 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 665234686432494 and 665234686432503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18478741289776 + ... + 18478741289811.

It is an arithmetic number, because the mean of its divisors is an integer number (120111818383661).

Almost surely, 2^{665234686432566} is an apocalyptic number.

665234686432566 is an abundant number, since it is smaller than the sum of its proper divisors (776107134171366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665234686432566 is a wasteful number, since it uses less digits than its factorization.

665234686432566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36957482579595 (or 36957482579592 counting only the distinct ones).

The product of its digits is 5374771200, while the sum is 72.

The spelling of 665234686432566 in words is "six hundred sixty-five trillion, two hundred thirty-four billion, six hundred eighty-six million, four hundred thirty-two thousand, five hundred sixty-six".