664717233 has 4 divisors (see below), whose sum is σ = 886289648. Its totient is φ = 443144820.

The previous prime is 664717231. The next prime is 664717241. The reversal of 664717233 is 332717466.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 664717233 - 2¹ = 664717231 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 664717191 and 664717200.

It is not an unprimeable number, because it can be changed into a prime (664717231) 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, 110786203 + ... + 110786208.

It is an arithmetic number, because the mean of its divisors is an integer number (221572412).

Almost surely, 2^664717233 is an apocalyptic number.

It is an amenable number.

664717233 is a deficient number, since it is larger than the sum of its proper divisors (221572415).

664717233 is a wasteful number, since it uses less digits than its factorization.

664717233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221572414.

The product of its digits is 127008, while the sum is 39.

The square root of 664717233 is about 25782.1107165414. The cubic root of 664717233 is about 872.7281398360.

The spelling of 664717233 in words is "six hundred sixty-four million, seven hundred seventeen thousand, two hundred thirty-three".