135487818561 has 16 divisors (see below), whose sum is σ = 190379782400. Its totient is φ = 85471605648.

The previous prime is 135487818533. The next prime is 135487818589. The reversal of 135487818561 is 165818784531.

It is an interprime number because it is at equal distance from previous prime (135487818533) and next prime (135487818589).

It is not a de Polignac number, because 135487818561 - 2³⁴ = 118307949377 is a prime.

It is a super-2 number, since 2×135487818561² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135487818461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1334611 + ... + 1432536.

It is an arithmetic number, because the mean of its divisors is an integer number (11898736400).

Almost surely, 2^135487818561 is an apocalyptic number.

It is an amenable number.

135487818561 is a deficient number, since it is larger than the sum of its proper divisors (54891963839).

135487818561 is a wasteful number, since it uses less digits than its factorization.

135487818561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768028.

The product of its digits is 6451200, while the sum is 57.

The spelling of 135487818561 in words is "one hundred thirty-five billion, four hundred eighty-seven million, eight hundred eighteen thousand, five hundred sixty-one".