163145220235251 has 4 divisors (see below), whose sum is σ = 217526960313672. Its totient is φ = 108763480156832.

The previous prime is 163145220235247. The next prime is 163145220235267. The reversal of 163145220235251 is 152532022541361.

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 163145220235251 - 2² = 163145220235247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (163145220235201) 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, 27190870039206 + ... + 27190870039211.

It is an arithmetic number, because the mean of its divisors is an integer number (54381740078418).

Almost surely, 2^{163145220235251} is an apocalyptic number.

163145220235251 is a deficient number, since it is larger than the sum of its proper divisors (54381740078421).

163145220235251 is an equidigital number, since it uses as much as digits as its factorization.

163145220235251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54381740078420.

The product of its (nonzero) digits is 432000, while the sum is 42.

The spelling of 163145220235251 in words is "one hundred sixty-three trillion, one hundred forty-five billion, two hundred twenty million, two hundred thirty-five thousand, two hundred fifty-one".