135531233520520 has 64 divisors (see below), whose sum is σ = 312400285560000. Its totient is φ = 52890093704448.

The previous prime is 135531233520499. The next prime is 135531233520521. The reversal of 135531233520520 is 25025332135531.

It is a super-2 number, since 2×135531233520520² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (135531233520521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44388195 + ... + 47343154.

It is an arithmetic number, because the mean of its divisors is an integer number (4881254461875).

Almost surely, 2^{135531233520520} is an apocalyptic number.

135531233520520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

135531233520520 is an abundant number, since it is smaller than the sum of its proper divisors (176869052039480).

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

135531233520520 is a wasteful number, since it uses less digits than its factorization.

135531233520520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91732262 (or 91732258 counting only the distinct ones).

The product of its (nonzero) digits is 405000, while the sum is 40.

The spelling of 135531233520520 in words is "one hundred thirty-five trillion, five hundred thirty-one billion, two hundred thirty-three million, five hundred twenty thousand, five hundred twenty".