135856658531 has 32 divisors (see below), whose sum is σ = 157843123200. Its totient is φ = 115633440000.

The previous prime is 135856658471. The next prime is 135856658551.

It is a happy number.

135856658531 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 135856658531 - 2²⁶ = 135789549667 is a prime.

It is a super-2 number, since 2×135856658531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135856658551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12005366 + ... + 12016676.

It is an arithmetic number, because the mean of its divisors is an integer number (4932597600).

Almost surely, 2^135856658531 is an apocalyptic number.

135856658531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135856658531 is a deficient number, since it is larger than the sum of its proper divisors (21986464669).

135856658531 is a wasteful number, since it uses less digits than its factorization.

135856658531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12011.

The product of its digits is 12960000, while the sum is 56.

The spelling of 135856658531 in words is "one hundred thirty-five billion, eight hundred fifty-six million, six hundred fifty-eight thousand, five hundred thirty-one".