16591406217937 has 2 divisors, whose sum is σ = 16591406217938. Its totient is φ = 16591406217936.

The previous prime is 16591406217917. The next prime is 16591406217941. The reversal of 16591406217937 is 73971260419561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11192029011601 + 5399377206336 = 3345449^2 + 2323656^2 .

It is a cyclic number.

It is not a de Polignac number, because 16591406217937 - 2⁷ = 16591406217809 is a prime.

It is not a weakly prime, because it can be changed into another prime (16591406217917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8295703108968 + 8295703108969.

It is an arithmetic number, because the mean of its divisors is an integer number (8295703108969).

Almost surely, 2^{16591406217937} is an apocalyptic number.

It is an amenable number.

16591406217937 is a deficient number, since it is larger than the sum of its proper divisors (1).

16591406217937 is an equidigital number, since it uses as much as digits as its factorization.

16591406217937 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17146080, while the sum is 61.

The spelling of 16591406217937 in words is "sixteen trillion, five hundred ninety-one billion, four hundred six million, two hundred seventeen thousand, nine hundred thirty-seven".