2161331346623 has 4 divisors (see below), whose sum is σ = 2161339635360. Its totient is φ = 2161323057888.

The previous prime is 2161331346571. The next prime is 2161331346631. The reversal of 2161331346623 is 3266431331612.

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 2161331346623 - 2²⁸ = 2161062911167 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 (2161331346653) 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, 3740090 + ... + 4279127.

It is an arithmetic number, because the mean of its divisors is an integer number (540334908840).

Almost surely, 2^{2161331346623} is an apocalyptic number.

2161331346623 is a deficient number, since it is larger than the sum of its proper divisors (8288737).

2161331346623 is an equidigital number, since it uses as much as digits as its factorization.

2161331346623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8288736.

The product of its digits is 279936, while the sum is 41.

The spelling of 2161331346623 in words is "two trillion, one hundred sixty-one billion, three hundred thirty-one million, three hundred forty-six thousand, six hundred twenty-three".