135365661 has 20 divisors (see below), whose sum is σ = 205239232. Its totient is φ = 88893288.

The previous prime is 135365653. The next prime is 135365663. The reversal of 135365661 is 166563531.

135365661 is a `hidden beast` number, since 13 + 536 + 56 + 61 = 666.

It is not a de Polignac number, because 135365661 - 2³ = 135365653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135365663) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7045 + ... + 17898.

Almost surely, 2^135365661 is an apocalyptic number.

It is an amenable number.

135365661 is a deficient number, since it is larger than the sum of its proper divisors (69873571).

135365661 is an equidigital number, since it uses as much as digits as its factorization.

135365661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25022 (or 25013 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 135365661 is about 11634.6749417420. The cubic root of 135365661 is about 513.4555305406.

The spelling of 135365661 in words is "one hundred thirty-five million, three hundred sixty-five thousand, six hundred sixty-one".