163744657 has 2 divisors, whose sum is σ = 163744658. Its totient is φ = 163744656.

The previous prime is 163744639. The next prime is 163744661. The reversal of 163744657 is 756447361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 162792081 + 952576 = 12759^2 + 976^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163744657 is a prime.

It is not a weakly prime, because it can be changed into another prime (163744667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81872328 + 81872329.

It is an arithmetic number, because the mean of its divisors is an integer number (81872329).

Almost surely, 2^163744657 is an apocalyptic number.

It is an amenable number.

163744657 is a deficient number, since it is larger than the sum of its proper divisors (1).

163744657 is an equidigital number, since it uses as much as digits as its factorization.

163744657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 43.

The square root of 163744657 is about 12796.2751220814. The cubic root of 163744657 is about 547.0861402597.

The spelling of 163744657 in words is "one hundred sixty-three million, seven hundred forty-four thousand, six hundred fifty-seven".