135263561631 has 8 divisors (see below), whose sum is σ = 196746998784. Its totient is φ = 81977916120.

The previous prime is 135263561627. The next prime is 135263561647. The reversal of 135263561631 is 136165362531.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 135263561631 - 2² = 135263561627 is a prime.

It is a super-2 number, since 2×135263561631² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135263561231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2049447871 + ... + 2049447936.

It is an arithmetic number, because the mean of its divisors is an integer number (24593374848).

Almost surely, 2^135263561631 is an apocalyptic number.

135263561631 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135263561631 is a deficient number, since it is larger than the sum of its proper divisors (61483437153).

135263561631 is a wasteful number, since it uses less digits than its factorization.

135263561631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4098895821.

The product of its digits is 291600, while the sum is 42.

Subtracting 135263561631 from its reverse (136165362531), we obtain a square (901800900 = 30030²).

The spelling of 135263561631 in words is "one hundred thirty-five billion, two hundred sixty-three million, five hundred sixty-one thousand, six hundred thirty-one".