3666645257631 has 24 divisors (see below), whose sum is σ = 5160660727680. Its totient is φ = 2315349846864.

The previous prime is 3666645257623. The next prime is 3666645257651. The reversal of 3666645257631 is 1367525466663.

It is not a de Polignac number, because 3666645257631 - 2³ = 3666645257623 is a prime.

It is a super-2 number, since 2×3666645257631² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666645257651) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5629350 + ... + 6246828.

It is an arithmetic number, because the mean of its divisors is an integer number (215027530320).

Almost surely, 2^{3666645257631} is an apocalyptic number.

3666645257631 is a deficient number, since it is larger than the sum of its proper divisors (1494015470049).

3666645257631 is a wasteful number, since it uses less digits than its factorization.

3666645257631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623003 (or 622984 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 60.

The spelling of 3666645257631 in words is "three trillion, six hundred sixty-six billion, six hundred forty-five million, two hundred fifty-seven thousand, six hundred thirty-one".