163461553 has 4 divisors (see below), whose sum is σ = 163487808. Its totient is φ = 163435300.

The previous prime is 163461539. The next prime is 163461559. The reversal of 163461553 is 355164361.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 163461553 - 2⁵ = 163461521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163461559) 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, 2100 + ... + 18202.

It is an arithmetic number, because the mean of its divisors is an integer number (40871952).

Almost surely, 2^163461553 is an apocalyptic number.

It is an amenable number.

163461553 is a deficient number, since it is larger than the sum of its proper divisors (26255).

163461553 is a wasteful number, since it uses less digits than its factorization.

163461553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26254.

The product of its digits is 32400, while the sum is 34.

The square root of 163461553 is about 12785.2083674847. The cubic root of 163461553 is about 546.7706661066.

The spelling of 163461553 in words is "one hundred sixty-three million, four hundred sixty-one thousand, five hundred fifty-three".