135644446531 has 4 divisors (see below), whose sum is σ = 147975759864. Its totient is φ = 123313133200.

The previous prime is 135644446481. The next prime is 135644446583.

135644446531 is nontrivially palindromic in base 10.

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 135644446531 - 2²⁵ = 135610892099 is a prime.

It is a super-2 number, since 2×135644446531² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (135644446591) 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, 6165656650 + ... + 6165656671.

It is an arithmetic number, because the mean of its divisors is an integer number (36993939966).

Almost surely, 2^135644446531 is an apocalyptic number.

135644446531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

135644446531 is a deficient number, since it is larger than the sum of its proper divisors (12331313333).

135644446531 is a wasteful number, since it uses less digits than its factorization.

135644446531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12331313332.

The product of its digits is 2073600, while the sum is 46.

The spelling of 135644446531 in words is "one hundred thirty-five billion, six hundred forty-four million, four hundred forty-six thousand, five hundred thirty-one".