2156643233 has 2 divisors, whose sum is σ = 2156643234. Its totient is φ = 2156643232.

The previous prime is 2156643221. The next prime is 2156643259. The reversal of 2156643233 is 3323466512.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2014842769 + 141800464 = 44887^2 + 11908^2 .

It is a cyclic number.

It is not a de Polignac number, because 2156643233 - 2⁶ = 2156643169 is a prime.

It is a super-2 number, since 2×2156643233² = 9302220068889384578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2156643193 and 2156643202.

It is not a weakly prime, because it can be changed into another prime (2156843233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078321616 + 1078321617.

It is an arithmetic number, because the mean of its divisors is an integer number (1078321617).

Almost surely, 2^2156643233 is an apocalyptic number.

It is an amenable number.

2156643233 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156643233 is an equidigital number, since it uses as much as digits as its factorization.

2156643233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 35.

The square root of 2156643233 is about 46439.6730500980. The cubic root of 2156643233 is about 1291.9908432050.

The spelling of 2156643233 in words is "two billion, one hundred fifty-six million, six hundred forty-three thousand, two hundred thirty-three".