135561856365 has 160 divisors (see below), whose sum is σ = 289146122496. Its totient is φ = 60080486400.

The previous prime is 135561856357. The next prime is 135561856387. The reversal of 135561856365 is 563658165531.

135561856365 is a `hidden beast` number, since 1 + 3 + 5 + 5 + 6 + 18 + 563 + 65 = 666.

It is not a de Polignac number, because 135561856365 - 2³ = 135561856357 is a prime.

It is a super-2 number, since 2×135561856365² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 2025690 + ... + 2091540.

Almost surely, 2^135561856365 is an apocalyptic number.

135561856365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

135561856365 is an abundant number, since it is smaller than the sum of its proper divisors (153584266131).

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

135561856365 is a wasteful number, since it uses less digits than its factorization.

135561856365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65921 (or 65912 counting only the distinct ones).

The product of its digits is 9720000, while the sum is 54.

The spelling of 135561856365 in words is "one hundred thirty-five billion, five hundred sixty-one million, eight hundred fifty-six thousand, three hundred sixty-five".