135212231544 has 96 divisors (see below), whose sum is σ = 366163455600. Its totient is φ = 41588951040.

The previous prime is 135212231537. The next prime is 135212231551. The reversal of 135212231544 is 445132212531.

It is an interprime number because it is at equal distance from previous prime (135212231537) and next prime (135212231551).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18495762 + ... + 18503070.

Almost surely, 2^135212231544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 135212231544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (183081727800).

135212231544 is an abundant number, since it is smaller than the sum of its proper divisors (230951224056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

135212231544 is a wasteful number, since it uses less digits than its factorization.

135212231544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11905 (or 11888 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The spelling of 135212231544 in words is "one hundred thirty-five billion, two hundred twelve million, two hundred thirty-one thousand, five hundred forty-four".