664725227 has 4 divisors (see below), whose sum is σ = 664779696. Its totient is φ = 664670760.

The previous prime is 664725221. The next prime is 664725301. The reversal of 664725227 is 722527466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 722527466 = 2 ⋅361263733.

It is a cyclic number.

It is not a de Polignac number, because 664725227 - 2⁶ = 664725163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664725221) 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, 458 + ... + 36464.

It is an arithmetic number, because the mean of its divisors is an integer number (166194924).

Almost surely, 2^664725227 is an apocalyptic number.

664725227 is a deficient number, since it is larger than the sum of its proper divisors (54469).

664725227 is a wasteful number, since it uses less digits than its factorization.

664725227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54468.

The product of its digits is 282240, while the sum is 41.

The square root of 664725227 is about 25782.2657460511. The cubic root of 664725227 is about 872.7316383465.

The spelling of 664725227 in words is "six hundred sixty-four million, seven hundred twenty-five thousand, two hundred twenty-seven".