2156055863 has 18 divisors (see below), whose sum is σ = 2388922992. Its totient is φ = 1944121920.

The previous prime is 2156055851. The next prime is 2156055887. The reversal of 2156055863 is 3685506512.

It is not a de Polignac number, because 2156055863 - 2⁸ = 2156055607 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2156055863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156055893) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 4138043 + ... + 4138563.

It is an arithmetic number, because the mean of its divisors is an integer number (132717944).

Almost surely, 2^2156055863 is an apocalyptic number.

2156055863 is a deficient number, since it is larger than the sum of its proper divisors (232867129).

2156055863 is an frugal number, since it uses more digits than its factorization.

2156055863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 41.

The square root of 2156055863 is about 46433.3486085163. The cubic root of 2156055863 is about 1291.8735396790.

The spelling of 2156055863 in words is "two billion, one hundred fifty-six million, fifty-five thousand, eight hundred sixty-three".