664112549 has 2 divisors, whose sum is σ = 664112550. Its totient is φ = 664112548.

The previous prime is 664112521. The next prime is 664112621. The reversal of 664112549 is 945211466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438902500 + 225210049 = 20950^2 + 15007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664112549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664112249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332056274 + 332056275.

It is an arithmetic number, because the mean of its divisors is an integer number (332056275).

Almost surely, 2^664112549 is an apocalyptic number.

It is an amenable number.

664112549 is a deficient number, since it is larger than the sum of its proper divisors (1).

664112549 is an equidigital number, since it uses as much as digits as its factorization.

664112549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 38.

The square root of 664112549 is about 25770.3812350535. The cubic root of 664112549 is about 872.4634233428.

The spelling of 664112549 in words is "six hundred sixty-four million, one hundred twelve thousand, five hundred forty-nine".