266408631 has 6 divisors (see below), whose sum is σ = 384812480. Its totient is φ = 177605748.

The previous prime is 266408627. The next prime is 266408641. The reversal of 266408631 is 136804662.

266408631 is a `hidden beast` number, since 2 + 6 + 640 + 8 + 6 + 3 + 1 = 666.

It is not a de Polignac number, because 266408631 - 2² = 266408627 is a prime.

It is a super-2 number, since 2×266408631² = 141947117342588322, 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 (266408641) 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, 14800471 + ... + 14800488.

Almost surely, 2^266408631 is an apocalyptic number.

266408631 is a deficient number, since it is larger than the sum of its proper divisors (118403849).

266408631 is a wasteful number, since it uses less digits than its factorization.

266408631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29600965 (or 29600962 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 266408631 is about 16322.0290098995. The cubic root of 266408631 is about 643.4519138238.

The spelling of 266408631 in words is "two hundred sixty-six million, four hundred eight thousand, six hundred thirty-one".