665432615331 has 24 divisors (see below), whose sum is σ = 1048784742720. Its totient is φ = 403206241200.

The previous prime is 665432615201. The next prime is 665432615333. The reversal of 665432615331 is 133516234566.

665432615331 is a `hidden beast` number, since 6 + 6 + 54 + 3 + 2 + 61 + 533 + 1 = 666.

It is not a de Polignac number, because 665432615331 - 2²⁵ = 665399060899 is a prime.

It is a super-2 number, since 2×665432615331² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665432615333) 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, 252021 + ... + 1180838.

It is an arithmetic number, because the mean of its divisors is an integer number (43699364280).

Almost surely, 2^665432615331 is an apocalyptic number.

665432615331 is a deficient number, since it is larger than the sum of its proper divisors (383352127389).

665432615331 is a wasteful number, since it uses less digits than its factorization.

665432615331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437567 (or 1437564 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 45.

Adding to 665432615331 its reverse (133516234566), we get a palindrome (798948849897).

The spelling of 665432615331 in words is "six hundred sixty-five billion, four hundred thirty-two million, six hundred fifteen thousand, three hundred thirty-one".