163664615 has 4 divisors (see below), whose sum is σ = 196397544. Its totient is φ = 130931688.

The previous prime is 163664609. The next prime is 163664617. The reversal of 163664615 is 516466361.

163664615 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 163664615 - 2²⁰ = 162616039 is a prime.

It is a super-2 number, since 2×163664615² = 53572212406196450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163664617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16366457 + ... + 16366466.

It is an arithmetic number, because the mean of its divisors is an integer number (49099386).

Almost surely, 2^163664615 is an apocalyptic number.

163664615 is a deficient number, since it is larger than the sum of its proper divisors (32732929).

163664615 is an equidigital number, since it uses as much as digits as its factorization.

163664615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32732928.

The product of its digits is 77760, while the sum is 38.

The square root of 163664615 is about 12793.1471890227. The cubic root of 163664615 is about 546.9969831401.

The spelling of 163664615 in words is "one hundred sixty-three million, six hundred sixty-four thousand, six hundred fifteen".