221525161015163 has 4 divisors (see below), whose sum is σ = 228671133951168. Its totient is φ = 214379188079160.

The previous prime is 221525161015111. The next prime is 221525161015229. The reversal of 221525161015163 is 361510161525122.

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 221525161015163 - 2³⁰ = 221524087273339 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 221525161015163.

It is not an unprimeable number, because it can be changed into a prime (221525161015363) 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, 3572986467956 + ... + 3572986468017.

It is an arithmetic number, because the mean of its divisors is an integer number (57167783487792).

Almost surely, 2^{221525161015163} is an apocalyptic number.

221525161015163 is a deficient number, since it is larger than the sum of its proper divisors (7145972936005).

221525161015163 is an equidigital number, since it uses as much as digits as its factorization.

221525161015163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7145972936004.

The product of its (nonzero) digits is 108000, while the sum is 41.

The spelling of 221525161015163 in words is "two hundred twenty-one trillion, five hundred twenty-five billion, one hundred sixty-one million, fifteen thousand, one hundred sixty-three".