664232117 has 2 divisors, whose sum is σ = 664232118. Its totient is φ = 664232116.

The previous prime is 664232099. The next prime is 664232119. The reversal of 664232117 is 711232466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 538657681 + 125574436 = 23209^2 + 11206^2 .

It is a cyclic number.

It is not a de Polignac number, because 664232117 - 2⁶ = 664232053 is a prime.

Together with 664232119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664232119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332116058 + 332116059.

It is an arithmetic number, because the mean of its divisors is an integer number (332116059).

Almost surely, 2^664232117 is an apocalyptic number.

It is an amenable number.

664232117 is a deficient number, since it is larger than the sum of its proper divisors (1).

664232117 is an equidigital number, since it uses as much as digits as its factorization.

664232117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 32.

The square root of 664232117 is about 25772.7010031933. The cubic root of 664232117 is about 872.5157801543.

The spelling of 664232117 in words is "six hundred sixty-four million, two hundred thirty-two thousand, one hundred seventeen".