161279137913 has 6 divisors (see below), whose sum is σ = 168596150394. Its totient is φ = 154267000976.

The previous prime is 161279137889. The next prime is 161279137927. The reversal of 161279137913 is 319731972161.

It can be written as a sum of positive squares in only one way, i.e., 121962989824 + 39316148089 = 349232^2 + 198283^2 .

It is not a de Polignac number, because 161279137913 - 2²⁰ = 161278089337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161279137933) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 152437220 + ... + 152438277.

It is an arithmetic number, because the mean of its divisors is an integer number (28099358399).

Almost surely, 2^161279137913 is an apocalyptic number.

It is an amenable number.

161279137913 is a deficient number, since it is larger than the sum of its proper divisors (7317012481).

161279137913 is an equidigital number, since it uses as much as digits as its factorization.

161279137913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304875543 (or 304875520 counting only the distinct ones).

The product of its digits is 428652, while the sum is 50.

The spelling of 161279137913 in words is "one hundred sixty-one billion, two hundred seventy-nine million, one hundred thirty-seven thousand, nine hundred thirteen".