2166202506191 has 2 divisors, whose sum is σ = 2166202506192. Its totient is φ = 2166202506190.

The previous prime is 2166202506173. The next prime is 2166202506239. The reversal of 2166202506191 is 1916052026612.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2166202506191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2166202506131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1083101253095 + 1083101253096.

It is an arithmetic number, because the mean of its divisors is an integer number (1083101253096).

Almost surely, 2^{2166202506191} is an apocalyptic number.

2166202506191 is a deficient number, since it is larger than the sum of its proper divisors (1).

2166202506191 is an equidigital number, since it uses as much as digits as its factorization.

2166202506191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 2166202506191 in words is "two trillion, one hundred sixty-six billion, two hundred two million, five hundred six thousand, one hundred ninety-one".