665504723 has 8 divisors (see below), whose sum is σ = 720413568. Its totient is φ = 611126784.

The previous prime is 665504717. The next prime is 665504737. The reversal of 665504723 is 327405566.

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 665504723 - 2⁸ = 665504467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665504783) 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, 130115 + ... + 135132.

It is an arithmetic number, because the mean of its divisors is an integer number (90051696).

Almost surely, 2^665504723 is an apocalyptic number.

665504723 is a deficient number, since it is larger than the sum of its proper divisors (54908845).

665504723 is a wasteful number, since it uses less digits than its factorization.

665504723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265453.

The product of its (nonzero) digits is 151200, while the sum is 38.

The square root of 665504723 is about 25797.3782195013. The cubic root of 665504723 is about 873.0726439482.

The spelling of 665504723 in words is "six hundred sixty-five million, five hundred four thousand, seven hundred twenty-three".