135555406240020 has 96 divisors (see below), whose sum is σ = 416463982607232. Its totient is φ = 32737909421568.

The previous prime is 135555406239961. The next prime is 135555406240021. The reversal of 135555406240020 is 20042604555531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135555406240021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1639477362 + ... + 1639560041.

It is an arithmetic number, because the mean of its divisors is an integer number (4338166485492).

Almost surely, 2^{135555406240020} is an apocalyptic number.

135555406240020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135555406240020 is an abundant number, since it is smaller than the sum of its proper divisors (280908576367212).

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

135555406240020 is a wasteful number, since it uses less digits than its factorization.

135555406240020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3279037481 (or 3279037479 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 42.

The spelling of 135555406240020 in words is "one hundred thirty-five trillion, five hundred fifty-five billion, four hundred six million, two hundred forty thousand, twenty".