156555120 has 80 divisors (see below), whose sum is σ = 495682560. Its totient is φ = 40856832.

The previous prime is 156555109. The next prime is 156555127. The reversal of 156555120 is 21555651.

156555120 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (156555127) 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, 4341 + ... + 18219.

It is an arithmetic number, because the mean of its divisors is an integer number (6196032).

Almost surely, 2^156555120 is an apocalyptic number.

156555120 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 156555120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247841280).

156555120 is an abundant number, since it is smaller than the sum of its proper divisors (339127440).

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

156555120 is a wasteful number, since it uses less digits than its factorization.

156555120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13942 (or 13936 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 156555120 is about 12512.1988475248. The cubic root of 156555120 is about 538.9590371400.

The spelling of 156555120 in words is "one hundred fifty-six million, five hundred fifty-five thousand, one hundred twenty".