135666553 has 16 divisors (see below), whose sum is σ = 154627200. Its totient is φ = 117895680.

The previous prime is 135666551. The next prime is 135666569. The reversal of 135666553 is 355666531.

It is a cyclic number.

It is not a de Polignac number, because 135666553 - 2¹ = 135666551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135666551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30793 + ... + 34921.

It is an arithmetic number, because the mean of its divisors is an integer number (9664200).

Almost surely, 2^135666553 is an apocalyptic number.

It is an amenable number.

135666553 is a deficient number, since it is larger than the sum of its proper divisors (18960647).

135666553 is a wasteful number, since it uses less digits than its factorization.

135666553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4272.

The product of its digits is 243000, while the sum is 40.

The square root of 135666553 is about 11647.5985937016. The cubic root of 135666553 is about 513.8356868540.

The spelling of 135666553 in words is "one hundred thirty-five million, six hundred sixty-six thousand, five hundred fifty-three".