665064263 has 4 divisors (see below), whose sum is σ = 671165880. Its totient is φ = 658962648.

The previous prime is 665064247. The next prime is 665064269. The reversal of 665064263 is 362460566.

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

It is a cyclic number.

It is not a de Polignac number, because 665064263 - 2⁴ = 665064247 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 (665064269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3050645 + ... + 3050862.

It is an arithmetic number, because the mean of its divisors is an integer number (167791470).

Almost surely, 2^665064263 is an apocalyptic number.

665064263 is a deficient number, since it is larger than the sum of its proper divisors (6101617).

665064263 is a wasteful number, since it uses less digits than its factorization.

665064263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6101616.

The product of its (nonzero) digits is 155520, while the sum is 38.

The square root of 665064263 is about 25788.8398924806. The cubic root of 665064263 is about 872.8799889438.

The spelling of 665064263 in words is "six hundred sixty-five million, sixty-four thousand, two hundred sixty-three".