665962239 has 8 divisors (see below), whose sum is σ = 888272512. Its totient is φ = 443813400.

The previous prime is 665962207. The next prime is 665962247. The reversal of 665962239 is 932269566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665962239 - 2⁵ = 665962207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665962249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30379 + ... + 47484.

It is an arithmetic number, because the mean of its divisors is an integer number (111034064).

Almost surely, 2^665962239 is an apocalyptic number.

665962239 is a deficient number, since it is larger than the sum of its proper divisors (222310273).

665962239 is a wasteful number, since it uses less digits than its factorization.

665962239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80717.

The product of its digits is 1049760, while the sum is 48.

The square root of 665962239 is about 25806.2441862430. The cubic root of 665962239 is about 873.2726691768.

The spelling of 665962239 in words is "six hundred sixty-five million, nine hundred sixty-two thousand, two hundred thirty-nine".