665264654 has 4 divisors (see below), whose sum is σ = 997896984. Its totient is φ = 332632326.

The previous prime is 665264617. The next prime is 665264683. The reversal of 665264654 is 456462566.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166316162 + ... + 166316165.

It is an arithmetic number, because the mean of its divisors is an integer number (249474246).

Almost surely, 2^665264654 is an apocalyptic number.

665264654 is a deficient number, since it is larger than the sum of its proper divisors (332632330).

665264654 is a wasteful number, since it uses less digits than its factorization.

665264654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332632329.

The product of its digits is 1036800, while the sum is 44.

The square root of 665264654 is about 25792.7248269740. The cubic root of 665264654 is about 872.9676495095.

The spelling of 665264654 in words is "six hundred sixty-five million, two hundred sixty-four thousand, six hundred fifty-four".