163256641 has 4 divisors (see below), whose sum is σ = 164782512. Its totient is φ = 161730772.

The previous prime is 163256609. The next prime is 163256657. The reversal of 163256641 is 146652361.

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 a cyclic number.

It is not a de Polignac number, because 163256641 - 2⁵ = 163256609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163256597 and 163256606.

It is not an unprimeable number, because it can be changed into a prime (163256441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 762775 + ... + 762988.

It is an arithmetic number, because the mean of its divisors is an integer number (41195628).

Almost surely, 2^163256641 is an apocalyptic number.

It is an amenable number.

163256641 is a deficient number, since it is larger than the sum of its proper divisors (1525871).

163256641 is a wasteful number, since it uses less digits than its factorization.

163256641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1525870.

The product of its digits is 25920, while the sum is 34.

The square root of 163256641 is about 12777.1922189501. The cubic root of 163256641 is about 546.5420971286.

The spelling of 163256641 in words is "one hundred sixty-three million, two hundred fifty-six thousand, six hundred forty-one".