155125520 has 80 divisors (see below), whose sum is σ = 395331840. Its totient is φ = 56140800.

The previous prime is 155125441. The next prime is 155125559. The reversal of 155125520 is 25521551.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 155125520.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359705 + ... + 360135.

It is an arithmetic number, because the mean of its divisors is an integer number (4941648).

Almost surely, 2^155125520 is an apocalyptic number.

155125520 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 155125520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (197665920).

155125520 is an abundant number, since it is smaller than the sum of its proper divisors (240206320).

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

155125520 is a wasteful number, since it uses less digits than its factorization.

155125520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864 (or 858 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 155125520 is about 12454.9395823504. The cubic root of 155125520 is about 537.3134972198.

The spelling of 155125520 in words is "one hundred fifty-five million, one hundred twenty-five thousand, five hundred twenty".