135744571881 has 24 divisors (see below), whose sum is σ = 201743245184. Its totient is φ = 87889445280.

The previous prime is 135744571877. The next prime is 135744571927. The reversal of 135744571881 is 188175447531.

It is a happy number.

135744571881 is a `hidden beast` number, since 1 + 3 + 5 + 7 + 4 + 457 + 188 + 1 = 666.

It is not a de Polignac number, because 135744571881 - 2² = 135744571877 is a prime.

It is a super-2 number, since 2×135744571881² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (135744571811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 190465 + ... + 554766.

Almost surely, 2^135744571881 is an apocalyptic number.

It is an amenable number.

135744571881 is a deficient number, since it is larger than the sum of its proper divisors (65998673303).

135744571881 is a wasteful number, since it uses less digits than its factorization.

135744571881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745821 (or 745818 counting only the distinct ones).

The product of its digits is 3763200, while the sum is 54.

The spelling of 135744571881 in words is "one hundred thirty-five billion, seven hundred forty-four million, five hundred seventy-one thousand, eight hundred eighty-one".