161613512586 has 12 divisors (see below), whose sum is σ = 350162610642. Its totient is φ = 53871170856.

The previous prime is 161613512581. The next prime is 161613512597. The reversal of 161613512586 is 685215316161.

It is a happy number.

161613512586 is a `hidden beast` number, since 1 + 6 + 1 + 6 + 13 + 51 + 2 + 586 = 666.

It can be written as a sum of positive squares in only one way, i.e., 88964396361 + 72649116225 = 298269^2 + 269535^2 .

It is a super-2 number, since 2×161613512586² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161613512581) 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, 4489264221 + ... + 4489264256.

Almost surely, 2^161613512586 is an apocalyptic number.

161613512586 is an abundant number, since it is smaller than the sum of its proper divisors (188549098056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161613512586 is a wasteful number, since it uses less digits than its factorization.

161613512586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8978528485 (or 8978528482 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The spelling of 161613512586 in words is "one hundred sixty-one billion, six hundred thirteen million, five hundred twelve thousand, five hundred eighty-six".