135640442125 has 32 divisors (see below), whose sum is σ = 178420825440. Its totient is φ = 102793600000.

The previous prime is 135640442117. The next prime is 135640442131. The reversal of 135640442125 is 521244046531.

It can be written as a sum of positive squares in 16 ways, for example, as 68926201444 + 66714240681 = 262538^2 + 258291^2 .

It is not a de Polignac number, because 135640442125 - 2³ = 135640442117 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 160876 + ... + 545125.

It is an arithmetic number, because the mean of its divisors is an integer number (5575650795).

Almost surely, 2^135640442125 is an apocalyptic number.

It is an amenable number.

135640442125 is a deficient number, since it is larger than the sum of its proper divisors (42780383315).

135640442125 is an equidigital number, since it uses as much as digits as its factorization.

135640442125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706098 (or 706088 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 37.

Adding to 135640442125 its reverse (521244046531), we get a palindrome (656884488656).

The spelling of 135640442125 in words is "one hundred thirty-five billion, six hundred forty million, four hundred forty-two thousand, one hundred twenty-five".