161123023211 has 4 divisors (see below), whose sum is σ = 165477699552. Its totient is φ = 156768346872.

The previous prime is 161123023207. The next prime is 161123023277. The reversal of 161123023211 is 112320321161.

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 161123023211 - 2² = 161123023207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161123023511) 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, 2177338115 + ... + 2177338188.

It is an arithmetic number, because the mean of its divisors is an integer number (41369424888).

Almost surely, 2^161123023211 is an apocalyptic number.

161123023211 is a deficient number, since it is larger than the sum of its proper divisors (4354676341).

161123023211 is an equidigital number, since it uses as much as digits as its factorization.

161123023211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4354676340.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 161123023211 its reverse (112320321161), we get a palindrome (273443344372).

The spelling of 161123023211 in words is "one hundred sixty-one billion, one hundred twenty-three million, twenty-three thousand, two hundred eleven".