163664401 has 4 divisors (see below), whose sum is σ = 164610612. Its totient is φ = 162718192.

The previous prime is 163664399. The next prime is 163664419. The reversal of 163664401 is 104466361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 104466361 = 79 ⋅1322359.

It can be written as a sum of positive squares in 2 ways, for example, as 83740801 + 79923600 = 9151^2 + 8940^2 .

It is a cyclic number.

It is not a de Polignac number, because 163664401 - 2¹ = 163664399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163664101) 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, 472846 + ... + 473191.

It is an arithmetic number, because the mean of its divisors is an integer number (41152653).

Almost surely, 2^163664401 is an apocalyptic number.

It is an amenable number.

163664401 is a deficient number, since it is larger than the sum of its proper divisors (946211).

163664401 is an equidigital number, since it uses as much as digits as its factorization.

163664401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946210.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 163664401 is about 12793.1388251672. The cubic root of 163664401 is about 546.9967447310.

The spelling of 163664401 in words is "one hundred sixty-three million, six hundred sixty-four thousand, four hundred one".