163644969 has 16 divisors (see below), whose sum is σ = 224570880. Its totient is φ = 105920640.

The previous prime is 163644953. The next prime is 163644983. The reversal of 163644969 is 969446361.

It is not a de Polignac number, because 163644969 - 2⁴ = 163644953 is a prime.

It is a super-2 number, since 2×163644969² = 53559351758021922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (163644769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61864 + ... + 64454.

It is an arithmetic number, because the mean of its divisors is an integer number (14035680).

Almost surely, 2^163644969 is an apocalyptic number.

It is an amenable number.

163644969 is a deficient number, since it is larger than the sum of its proper divisors (60925911).

163644969 is a wasteful number, since it uses less digits than its factorization.

163644969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3200.

The product of its digits is 839808, while the sum is 48.

The square root of 163644969 is about 12792.3793330248. The cubic root of 163644969 is about 546.9750954263.

The spelling of 163644969 in words is "one hundred sixty-three million, six hundred forty-four thousand, nine hundred sixty-nine".