155319999120 has 640 divisors, whose sum is σ = 655878021120. Its totient is φ = 33244231680.

The previous prime is 155319999013. The next prime is 155319999161. The reversal of 155319999120 is 21999913551.

155319999120 is a `hidden beast` number, since 1 + 5 + 531 + 9 + 9 + 99 + 12 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 7093309 + ... + 7115171.

It is an arithmetic number, because the mean of its divisors is an integer number (1024809408).

Almost surely, 2^155319999120 is an apocalyptic number.

155319999120 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 155319999120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (327939010560).

155319999120 is an abundant number, since it is smaller than the sum of its proper divisors (500558022000).

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

155319999120 is a wasteful number, since it uses less digits than its factorization.

155319999120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21932 (or 21920 counting only the distinct ones).

The product of its (nonzero) digits is 984150, while the sum is 54.

It can be divided in two parts, 15 and 5319999120, that added together give a palindrome (5319999135).

The spelling of 155319999120 in words is "one hundred fifty-five billion, three hundred nineteen million, nine hundred ninety-nine thousand, one hundred twenty".