163641421426231 has 4 divisors (see below), whose sum is σ = 187018767344272. Its totient is φ = 140264075508192.

The previous prime is 163641421426213. The next prime is 163641421426247. The reversal of 163641421426231 is 132624124146361.

It is a happy number.

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 163641421426231 - 2¹⁷ = 163641421295159 is a prime.

It is a super-2 number, since 2×163641421426231² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163641421426211) 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, 11688672959010 + ... + 11688672959023.

It is an arithmetic number, because the mean of its divisors is an integer number (46754691836068).

Almost surely, 2^{163641421426231} is an apocalyptic number.

163641421426231 is a deficient number, since it is larger than the sum of its proper divisors (23377345918041).

163641421426231 is an equidigital number, since it uses as much as digits as its factorization.

163641421426231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23377345918040.

The product of its digits is 995328, while the sum is 46.

The spelling of 163641421426231 in words is "one hundred sixty-three trillion, six hundred forty-one billion, four hundred twenty-one million, four hundred twenty-six thousand, two hundred thirty-one".