2156105580 has 96 divisors (see below), whose sum is σ = 6455816640. Its totient is φ = 535756800.

The previous prime is 2156105569. The next prime is 2156105593. The reversal of 2156105580 is 855016512.

It is a super-3 number, since 3×2156105580³ (a number of 29 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92556 + ... + 113484.

It is an arithmetic number, because the mean of its divisors is an integer number (67248090).

Almost surely, 2^2156105580 is an apocalyptic number.

2156105580 is a gapful number since it is divisible by the number (20) 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 2156105580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3227908320).

2156105580 is an abundant number, since it is smaller than the sum of its proper divisors (4299711060).

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

2156105580 is a wasteful number, since it uses less digits than its factorization.

2156105580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21059 (or 21057 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 2156105580 is about 46433.8839641915. The cubic root of 2156105580 is about 1291.8834694748.

The spelling of 2156105580 in words is "two billion, one hundred fifty-six million, one hundred five thousand, five hundred eighty".