4166993891 has 2 divisors, whose sum is σ = 4166993892. Its totient is φ = 4166993890.

The previous prime is 4166993863. The next prime is 4166993893. The reversal of 4166993891 is 1983996614.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4166993891 - 2²² = 4162799587 is a prime.

Together with 4166993893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (4166993893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2083496945 + 2083496946.

It is an arithmetic number, because the mean of its divisors is an integer number (2083496946).

Almost surely, 2^4166993891 is an apocalyptic number.

4166993891 is a deficient number, since it is larger than the sum of its proper divisors (1).

4166993891 is an equidigital number, since it uses as much as digits as its factorization.

4166993891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2519424, while the sum is 56.

The square root of 4166993891 is about 64552.2570558149. The cubic root of 4166993891 is about 1609.1910974561.

The spelling of 4166993891 in words is "four billion, one hundred sixty-six million, nine hundred ninety-three thousand, eight hundred ninety-one".