305666631 has 6 divisors (see below), whose sum is σ = 441518480. Its totient is φ = 203777748.

The previous prime is 305666609. The next prime is 305666633. The reversal of 305666631 is 136666503.

It is a happy number.

It is not a de Polignac number, because 305666631 - 2⁶ = 305666567 is a prime.

It is a super-2 number, since 2×305666631² = 186864178613780322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (305666633) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16981471 + ... + 16981488.

Almost surely, 2^305666631 is an apocalyptic number.

305666631 is a deficient number, since it is larger than the sum of its proper divisors (135851849).

305666631 is a wasteful number, since it uses less digits than its factorization.

305666631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33962965 (or 33962962 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 36.

The square root of 305666631 is about 17483.3243692382. The cubic root of 305666631 is about 673.6216085552.

It can be divided in two parts, 30 and 5666631, that added together give a triangular number (5666661 = T₃₃₆₆).

The spelling of 305666631 in words is "three hundred five million, six hundred sixty-six thousand, six hundred thirty-one".