666361131 has 4 divisors (see below), whose sum is σ = 888481512. Its totient is φ = 444240752.

The previous prime is 666361123. The next prime is 666361177. The reversal of 666361131 is 131163666.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 666361131 - 2³ = 666361123 is a prime.

It is a super-2 number, since 2×666361131² = 888074313815198322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 666361092 and 666361101.

It is not an unprimeable number, because it can be changed into a prime (666361831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111060186 + ... + 111060191.

It is an arithmetic number, because the mean of its divisors is an integer number (222120378).

Almost surely, 2^666361131 is an apocalyptic number.

666361131 is a deficient number, since it is larger than the sum of its proper divisors (222120381).

666361131 is a wasteful number, since it uses less digits than its factorization.

666361131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222120380.

The product of its digits is 11664, while the sum is 33.

The square root of 666361131 is about 25813.9716239094. The cubic root of 666361131 is about 873.4469893486.

The spelling of 666361131 in words is "six hundred sixty-six million, three hundred sixty-one thousand, one hundred thirty-one".