8155581280 has 192 divisors, whose sum is σ = 25286929920. Its totient is φ = 2408140800.

The previous prime is 8155581263. The next prime is 8155581281. The reversal of 8155581280 is 821855518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8155581281) 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, 216660 + ... + 251500.

It is an arithmetic number, because the mean of its divisors is an integer number (131702760).

Almost surely, 2^8155581280 is an apocalyptic number.

8155581280 is a gapful number since it is divisible by the number (80) 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 8155581280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12643464960).

8155581280 is an abundant number, since it is smaller than the sum of its proper divisors (17131348640).

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

8155581280 is a wasteful number, since it uses less digits than its factorization.

8155581280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34893 (or 34885 counting only the distinct ones).

The product of its (nonzero) digits is 128000, while the sum is 43.

The square root of 8155581280 is about 90308.2569868337. The cubic root of 8155581280 is about 2012.8819561287.

The spelling of 8155581280 in words is "eight billion, one hundred fifty-five million, five hundred eighty-one thousand, two hundred eighty".