664677137 has 2 divisors, whose sum is σ = 664677138. Its totient is φ = 664677136.

The previous prime is 664677121. The next prime is 664677151. The reversal of 664677137 is 731776466.

664677137 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 655411201 + 9265936 = 25601^2 + 3044^2 .

It is a cyclic number.

It is not a de Polignac number, because 664677137 - 2⁴ = 664677121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 664677091 and 664677100.

It is not a weakly prime, because it can be changed into another prime (664677157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332338568 + 332338569.

It is an arithmetic number, because the mean of its divisors is an integer number (332338569).

Almost surely, 2^664677137 is an apocalyptic number.

It is an amenable number.

664677137 is a deficient number, since it is larger than the sum of its proper divisors (1).

664677137 is an equidigital number, since it uses as much as digits as its factorization.

664677137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 889056, while the sum is 47.

The square root of 664677137 is about 25781.3331113812. Note that the first 3 decimals coincide. The cubic root of 664677137 is about 872.7105917171.

The spelling of 664677137 in words is "six hundred sixty-four million, six hundred seventy-seven thousand, one hundred thirty-seven".