155120144520 has 128 divisors (see below), whose sum is σ = 509201095680. Its totient is φ = 37491168000.

The previous prime is 155120144483. The next prime is 155120144521. The reversal of 155120144520 is 25441021551.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (155120144521) 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, 259405 + ... + 614435.

It is an arithmetic number, because the mean of its divisors is an integer number (3978133560).

Almost surely, 2^155120144520 is an apocalyptic number.

155120144520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155120144520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (254600547840).

155120144520 is an abundant number, since it is smaller than the sum of its proper divisors (354080951160).

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

155120144520 is a wasteful number, since it uses less digits than its factorization.

155120144520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355387 (or 355383 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The spelling of 155120144520 in words is "one hundred fifty-five billion, one hundred twenty million, one hundred forty-four thousand, five hundred twenty".