665683162685 has 16 divisors (see below), whose sum is σ = 799611404592. Its totient is φ = 532019059200.

The previous prime is 665683162667. The next prime is 665683162687. The reversal of 665683162685 is 586261386566.

It can be written as a sum of positive squares in 8 ways, for example, as 124018074244 + 541665088441 = 352162^2 + 735979^2 .

It is not a de Polignac number, because 665683162685 - 2⁶ = 665683162621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665683162687) 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, 22766375 + ... + 22795595.

It is an arithmetic number, because the mean of its divisors is an integer number (49975712787).

Almost surely, 2^665683162685 is an apocalyptic number.

It is an amenable number.

665683162685 is a deficient number, since it is larger than the sum of its proper divisors (133928241907).

665683162685 is a wasteful number, since it uses less digits than its factorization.

665683162685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33584.

The product of its digits is 74649600, while the sum is 62.

The spelling of 665683162685 in words is "six hundred sixty-five billion, six hundred eighty-three million, one hundred sixty-two thousand, six hundred eighty-five".