163709649 has 6 divisors (see below), whose sum is σ = 236469506. Its totient is φ = 109139760.

The previous prime is 163709627. The next prime is 163709659. The reversal of 163709649 is 946907361.

163709649 is a `hidden beast` number, since 1 + 637 + 0 + 9 + 6 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 147185424 + 16524225 = 12132^2 + 4065^2 .

It is not a de Polignac number, because 163709649 - 2⁸ = 163709393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163709659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9094972 + ... + 9094989.

Almost surely, 2^163709649 is an apocalyptic number.

It is an amenable number.

163709649 is a deficient number, since it is larger than the sum of its proper divisors (72759857).

163709649 is a wasteful number, since it uses less digits than its factorization.

163709649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18189967 (or 18189964 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 163709649 is about 12794.9071508941. The cubic root of 163709649 is about 547.0471491520.

It can be divided in two parts, 1637096 and 49, that added together give a triangular number (1637145 = T₁₈₀₉).

The spelling of 163709649 in words is "one hundred sixty-three million, seven hundred nine thousand, six hundred forty-nine".