135563632251 has 4 divisors (see below), whose sum is σ = 180751509672. Its totient is φ = 90375754832.

The previous prime is 135563632213. The next prime is 135563632291. The reversal of 135563632251 is 152236365531.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 135563632251 - 2²² = 135559437947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (135563632291) 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, 22593938706 + ... + 22593938711.

It is an arithmetic number, because the mean of its divisors is an integer number (45187877418).

Almost surely, 2^135563632251 is an apocalyptic number.

135563632251 is a deficient number, since it is larger than the sum of its proper divisors (45187877421).

135563632251 is an equidigital number, since it uses as much as digits as its factorization.

135563632251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45187877420.

The product of its digits is 486000, while the sum is 42.

Adding to 135563632251 its reverse (152236365531), we get a palindrome (287799997782).

The spelling of 135563632251 in words is "one hundred thirty-five billion, five hundred sixty-three million, six hundred thirty-two thousand, two hundred fifty-one".