2166120511 has 2 divisors, whose sum is σ = 2166120512. Its totient is φ = 2166120510.

The previous prime is 2166120503. The next prime is 2166120557. The reversal of 2166120511 is 1150216612.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2166120511 - 2³ = 2166120503 is a prime.

It is a super-2 number, since 2×2166120511² = 9384156136349802242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166120311) 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 as a sum of consecutive naturals, namely, 1083060255 + 1083060256.

It is an arithmetic number, because the mean of its divisors is an integer number (1083060256).

Almost surely, 2^2166120511 is an apocalyptic number.

2166120511 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166120511 is an equidigital number, since it uses as much as digits as its factorization.

2166120511 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2166120511 is about 46541.5997898654. The cubic root of 2166120511 is about 1293.8806108781.

The spelling of 2166120511 in words is "two billion, one hundred sixty-six million, one hundred twenty thousand, five hundred eleven".