135511598161 has 9 divisors (see below), whose sum is σ = 136558775899. Its totient is φ = 134472398224.

The previous prime is 135511598153. The next prime is 135511598197. The reversal of 135511598161 is 161895115531.

The square root of 135511598161 is 368119.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 79600158225 + 55911439936 = 282135^2 + 236456^2 .

It is not a de Polignac number, because 135511598161 - 2³ = 135511598153 is a prime.

It is a super-2 number, since 2×135511598161² (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 (135511596161) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 50430960 + ... + 50433646.

Almost surely, 2^135511598161 is an apocalyptic number.

135511598161 is the 368119-th square number.

135511598161 is the 184060-th centered octagonal number.

It is an amenable number.

135511598161 is a deficient number, since it is larger than the sum of its proper divisors (1047177738).

135511598161 is an frugal number, since it uses more digits than its factorization.

135511598161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5648 (or 2824 counting only the distinct ones).

The product of its digits is 162000, while the sum is 46.

The spelling of 135511598161 in words is "one hundred thirty-five billion, five hundred eleven million, five hundred ninety-eight thousand, one hundred sixty-one".