665330131 has 4 divisors (see below), whose sum is σ = 694257552. Its totient is φ = 636402712.

The previous prime is 665330129. The next prime is 665330143. The reversal of 665330131 is 131033566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131033566 = 2 ⋅65516783.

It is a cyclic number.

It is not a de Polignac number, because 665330131 - 2¹ = 665330129 is a prime.

It is a super-2 number, since 2×665330131² = 885328366432954322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 665330131.

It is not an unprimeable number, because it can be changed into a prime (665300131) 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, 14463676 + ... + 14463721.

It is an arithmetic number, because the mean of its divisors is an integer number (173564388).

Almost surely, 2^665330131 is an apocalyptic number.

665330131 is a deficient number, since it is larger than the sum of its proper divisors (28927421).

665330131 is a wasteful number, since it uses less digits than its factorization.

665330131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28927420.

The product of its (nonzero) digits is 4860, while the sum is 28.

The square root of 665330131 is about 25793.9940877717. The cubic root of 665330131 is about 872.9962884516.

Adding to 665330131 its reverse (131033566), we get a palindrome (796363697).

The spelling of 665330131 in words is "six hundred sixty-five million, three hundred thirty thousand, one hundred thirty-one".