161357316123 has 4 divisors (see below), whose sum is σ = 215143088168. Its totient is φ = 107571544080.

The previous prime is 161357316121. The next prime is 161357316143. The reversal of 161357316123 is 321613753161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321613753161 = 3 ⋅107204584387.

It is not a de Polignac number, because 161357316123 - 2¹ = 161357316121 is a prime.

It is a super-2 number, since 2×161357316123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161357316121) 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, 26892886018 + ... + 26892886023.

It is an arithmetic number, because the mean of its divisors is an integer number (53785772042).

Almost surely, 2^161357316123 is an apocalyptic number.

161357316123 is a deficient number, since it is larger than the sum of its proper divisors (53785772045).

161357316123 is an equidigital number, since it uses as much as digits as its factorization.

161357316123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53785772044.

The product of its digits is 68040, while the sum is 39.

The spelling of 161357316123 in words is "one hundred sixty-one billion, three hundred fifty-seven million, three hundred sixteen thousand, one hundred twenty-three".