665424765 has 48 divisors (see below), whose sum is σ = 1196382720. Its totient is φ = 341781120.

The previous prime is 665424763. The next prime is 665424769. The reversal of 665424765 is 567424566.

665424765 is a `hidden beast` number, since 6 + 6 + 542 + 47 + 65 = 666.

It is not a de Polignac number, because 665424765 - 2¹ = 665424763 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 665424765.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665424763) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 318414 + ... + 320496.

It is an arithmetic number, because the mean of its divisors is an integer number (24924640).

Almost surely, 2^665424765 is an apocalyptic number.

It is an amenable number.

665424765 is a deficient number, since it is larger than the sum of its proper divisors (530957955).

665424765 is a wasteful number, since it uses less digits than its factorization.

665424765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2354 (or 2351 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 45.

The square root of 665424765 is about 25795.8284418237. The cubic root of 665424765 is about 873.0376770346.

The spelling of 665424765 in words is "six hundred sixty-five million, four hundred twenty-four thousand, seven hundred sixty-five".