18151555680 has 288 divisors, whose sum is σ = 64912053024. Its totient is φ = 4789518336.

The previous prime is 18151555661. The next prime is 18151555687. The reversal of 18151555680 is 8655515181.

18151555680 is a `hidden beast` number, since 1 + 8 + 1 + 5 + 15 + 556 + 80 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18151555687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3768954 + ... + 3773766.

It is an arithmetic number, because the mean of its divisors is an integer number (225389073).

Almost surely, 2^18151555680 is an apocalyptic number.

18151555680 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 18151555680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32456026512).

18151555680 is an abundant number, since it is smaller than the sum of its proper divisors (46760497344).

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

18151555680 is an equidigital number, since it uses as much as digits as its factorization.

18151555680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4940 (or 4920 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 45.

The spelling of 18151555680 in words is "eighteen billion, one hundred fifty-one million, five hundred fifty-five thousand, six hundred eighty".