135666666531 has 48 divisors (see below), whose sum is σ = 225346020480. Its totient is φ = 79999760160.

The previous prime is 135666666529. The next prime is 135666666539.

135666666531 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 135666666531 - 2¹ = 135666666529 is a prime.

It is a super-2 number, since 2×135666666531² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (135666666539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 239760 + ... + 573426.

It is an arithmetic number, because the mean of its divisors is an integer number (4694708760).

Almost surely, 2^135666666531 is an apocalyptic number.

135666666531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135666666531 is a deficient number, since it is larger than the sum of its proper divisors (89679353949).

135666666531 is a wasteful number, since it uses less digits than its factorization.

135666666531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333761 (or 333718 counting only the distinct ones).

The product of its digits is 10497600, while the sum is 54.

It can be divided in two parts, 135 and 666666531, that added together give a palindrome (666666666).

The spelling of 135666666531 in words is "one hundred thirty-five billion, six hundred sixty-six million, six hundred sixty-six thousand, five hundred thirty-one".