16945409791 has 2 divisors, whose sum is σ = 16945409792. Its totient is φ = 16945409790.

The previous prime is 16945409779. The next prime is 16945409801. The reversal of 16945409791 is 19790454961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16945409791 - 2¹⁷ = 16945278719 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16945409731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8472704895 + 8472704896.

It is an arithmetic number, because the mean of its divisors is an integer number (8472704896).

Almost surely, 2^16945409791 is an apocalyptic number.

16945409791 is a deficient number, since it is larger than the sum of its proper divisors (1).

16945409791 is an equidigital number, since it uses as much as digits as its factorization.

16945409791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 16945409791 in words is "sixteen billion, nine hundred forty-five million, four hundred nine thousand, seven hundred ninety-one".