135129680020 has 24 divisors (see below), whose sum is σ = 283782076200. Its totient is φ = 54050015232.

The previous prime is 135129680003. The next prime is 135129680029. The reversal of 135129680020 is 20086921531.

It can be written as a sum of positive squares in 4 ways, for example, as 5251611024 + 129878068996 = 72468^2 + 360386^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135129680029) 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, 583596 + ... + 781564.

It is an arithmetic number, because the mean of its divisors is an integer number (11824253175).

Almost surely, 2^135129680020 is an apocalyptic number.

135129680020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135129680020 is an abundant number, since it is smaller than the sum of its proper divisors (148652396180).

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

135129680020 is a wasteful number, since it uses less digits than its factorization.

135129680020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232107 (or 232105 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The spelling of 135129680020 in words is "one hundred thirty-five billion, one hundred twenty-nine million, six hundred eighty thousand, twenty".