664465157 has 2 divisors, whose sum is σ = 664465158. Its totient is φ = 664465156.

The previous prime is 664465141. The next prime is 664465159. The reversal of 664465157 is 751564466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564585121 + 99880036 = 23761^2 + 9994^2 .

It is a cyclic number.

It is not a de Polignac number, because 664465157 - 2⁴ = 664465141 is a prime.

Together with 664465159, 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 (664465159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332232578 + 332232579.

It is an arithmetic number, because the mean of its divisors is an integer number (332232579).

Almost surely, 2^664465157 is an apocalyptic number.

It is an amenable number.

664465157 is a deficient number, since it is larger than the sum of its proper divisors (1).

664465157 is an equidigital number, since it uses as much as digits as its factorization.

664465157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 44.

The square root of 664465157 is about 25777.2216695283. The cubic root of 664465157 is about 872.6178063877.

The spelling of 664465157 in words is "six hundred sixty-four million, four hundred sixty-five thousand, one hundred fifty-seven".