135663653 has 4 divisors (see below), whose sum is σ = 140341740. Its totient is φ = 130985568.

The previous prime is 135663631. The next prime is 135663701. The reversal of 135663653 is 356366531.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 356366531 = 23 ⋅15494197.

It can be written as a sum of positive squares in 2 ways, for example, as 80874049 + 54789604 = 8993^2 + 7402^2 .

It is a cyclic number.

It is not a de Polignac number, because 135663653 - 2⁶ = 135663589 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135563653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2339000 + ... + 2339057.

It is an arithmetic number, because the mean of its divisors is an integer number (35085435).

Almost surely, 2^135663653 is an apocalyptic number.

It is an amenable number.

135663653 is a deficient number, since it is larger than the sum of its proper divisors (4678087).

135663653 is an equidigital number, since it uses as much as digits as its factorization.

135663653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4678086.

The product of its digits is 145800, while the sum is 38.

The square root of 135663653 is about 11647.4741038562. The cubic root of 135663653 is about 513.8320255878.

The spelling of 135663653 in words is "one hundred thirty-five million, six hundred sixty-three thousand, six hundred fifty-three".