2155982881 has 8 divisors (see below), whose sum is σ = 2325197504. Its totient is φ = 1987249680.

The previous prime is 2155982879. The next prime is 2155982887. The reversal of 2155982881 is 1882895512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2155982881 - 2¹ = 2155982879 is a prime.

It is a super-2 number, since 2×2155982881² = 9296524366330120322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2155982887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111021 + ... + 128986.

It is an arithmetic number, because the mean of its divisors is an integer number (290649688).

Almost surely, 2^2155982881 is an apocalyptic number.

It is an amenable number.

2155982881 is a deficient number, since it is larger than the sum of its proper divisors (169214623).

2155982881 is a wasteful number, since it uses less digits than its factorization.

2155982881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240711.

The product of its digits is 460800, while the sum is 49.

The square root of 2155982881 is about 46432.5627227272. The cubic root of 2155982881 is about 1291.8589629728.

The spelling of 2155982881 in words is "two billion, one hundred fifty-five million, nine hundred eighty-two thousand, eight hundred eighty-one".