163621220440661 has 8 divisors (see below), whose sum is σ = 163839912297600. Its totient is φ = 163402530768000.

The previous prime is 163621220440619. The next prime is 163621220440681. The reversal of 163621220440661 is 166044022126361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163621220440661 - 2⁶ = 163621220440597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163621220440681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197105570 + ... + 197933948.

It is an arithmetic number, because the mean of its divisors is an integer number (20479989037200).

Almost surely, 2^{163621220440661} is an apocalyptic number.

It is an amenable number.

163621220440661 is a deficient number, since it is larger than the sum of its proper divisors (218691856939).

163621220440661 is an equidigital number, since it uses as much as digits as its factorization.

163621220440661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1092139.

The product of its (nonzero) digits is 497664, while the sum is 44.

The spelling of 163621220440661 in words is "one hundred sixty-three trillion, six hundred twenty-one billion, two hundred twenty million, four hundred forty thousand, six hundred sixty-one".