16543390091 has 2 divisors, whose sum is σ = 16543390092. Its totient is φ = 16543390090.

The previous prime is 16543390069. The next prime is 16543390103. The reversal of 16543390091 is 19009334561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16543390091 - 2³⁰ = 15469648267 is a prime.

It is not a weakly prime, because it can be changed into another prime (16543390051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8271695045 + 8271695046.

It is an arithmetic number, because the mean of its divisors is an integer number (8271695046).

Almost surely, 2^16543390091 is an apocalyptic number.

16543390091 is a deficient number, since it is larger than the sum of its proper divisors (1).

16543390091 is an equidigital number, since it uses as much as digits as its factorization.

16543390091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87480, while the sum is 41.

The spelling of 16543390091 in words is "sixteen billion, five hundred forty-three million, three hundred ninety thousand, ninety-one".