2156566576243 has 2 divisors, whose sum is σ = 2156566576244. Its totient is φ = 2156566576242.

The previous prime is 2156566576211. The next prime is 2156566576277. The reversal of 2156566576243 is 3426756656512.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2156566576243 - 2⁵ = 2156566576211 is a prime.

It is not a weakly prime, because it can be changed into another prime (2156566576643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078283288121 + 1078283288122.

It is an arithmetic number, because the mean of its divisors is an integer number (1078283288122).

Almost surely, 2^{2156566576243} is an apocalyptic number.

2156566576243 is a deficient number, since it is larger than the sum of its proper divisors (1).

2156566576243 is an equidigital number, since it uses as much as digits as its factorization.

2156566576243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432000, while the sum is 58.

The spelling of 2156566576243 in words is "two trillion, one hundred fifty-six billion, five hundred sixty-six million, five hundred seventy-six thousand, two hundred forty-three".