665643713 has 8 divisors (see below), whose sum is σ = 793811328. Its totient is φ = 545745024.

The previous prime is 665643679. The next prime is 665643731. The reversal of 665643713 is 317346566.

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 665643713 - 2²² = 661449409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665643743) 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, 2067056 + ... + 2067377.

It is an arithmetic number, because the mean of its divisors is an integer number (99226416).

Almost surely, 2^665643713 is an apocalyptic number.

It is an amenable number.

665643713 is a deficient number, since it is larger than the sum of its proper divisors (128167615).

665643713 is a wasteful number, since it uses less digits than its factorization.

665643713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134463.

The product of its digits is 272160, while the sum is 41.

The square root of 665643713 is about 25800.0719572640. The cubic root of 665643713 is about 873.1334198354.

The spelling of 665643713 in words is "six hundred sixty-five million, six hundred forty-three thousand, seven hundred thirteen".