163604433253161 has 4 divisors (see below), whose sum is σ = 218139244337552. Its totient is φ = 109069622168772.

The previous prime is 163604433253153. The next prime is 163604433253169. The reversal of 163604433253161 is 161352334406361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (163604433253153) and next prime (163604433253169).

It is not a de Polignac number, because 163604433253161 - 2³ = 163604433253153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163604433253161.

It is not an unprimeable number, because it can be changed into a prime (163604433253169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27267405542191 + ... + 27267405542196.

It is an arithmetic number, because the mean of its divisors is an integer number (54534811084388).

Almost surely, 2^{163604433253161} is an apocalyptic number.

It is an amenable number.

163604433253161 is a deficient number, since it is larger than the sum of its proper divisors (54534811084391).

163604433253161 is an equidigital number, since it uses as much as digits as its factorization.

163604433253161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54534811084390.

The product of its (nonzero) digits is 2799360, while the sum is 48.

The spelling of 163604433253161 in words is "one hundred sixty-three trillion, six hundred four billion, four hundred thirty-three million, two hundred fifty-three thousand, one hundred sixty-one".