16591406217913 has 2 divisors, whose sum is σ = 16591406217914. Its totient is φ = 16591406217912.

The previous prime is 16591406217839. The next prime is 16591406217917. The reversal of 16591406217913 is 31971260419561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15319184644729 + 1272221573184 = 3913973^2 + 1127928^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16591406217913 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 polite number, since it can be written as a sum of consecutive naturals, namely, 8295703108956 + 8295703108957.

It is an arithmetic number, because the mean of its divisors is an integer number (8295703108957).

Almost surely, 2^{16591406217913} is an apocalyptic number.

It is an amenable number.

16591406217913 is a deficient number, since it is larger than the sum of its proper divisors (1).

16591406217913 is an equidigital number, since it uses as much as digits as its factorization.

16591406217913 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 16591406217913 in words is "sixteen trillion, five hundred ninety-one billion, four hundred six million, two hundred seventeen thousand, nine hundred thirteen".