665135767 has 8 divisors (see below), whose sum is σ = 674194400. Its totient is φ = 656131104.

The previous prime is 665135759. The next prime is 665135771. The reversal of 665135767 is 767531566.

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

It is a cyclic number.

It is not a de Polignac number, because 665135767 - 2³ = 665135759 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 (665135747) 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, 11638 + ... + 38284.

It is an arithmetic number, because the mean of its divisors is an integer number (84274300).

Almost surely, 2^665135767 is an apocalyptic number.

665135767 is a deficient number, since it is larger than the sum of its proper divisors (9058633).

665135767 is a wasteful number, since it uses less digits than its factorization.

665135767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26985.

The product of its digits is 793800, while the sum is 46.

The square root of 665135767 is about 25790.2261913307. The cubic root of 665135767 is about 872.9112702186.

The spelling of 665135767 in words is "six hundred sixty-five million, one hundred thirty-five thousand, seven hundred sixty-seven".