16891512422399 has 2 divisors, whose sum is σ = 16891512422400. Its totient is φ = 16891512422398.

The previous prime is 16891512422387. The next prime is 16891512422459. The reversal of 16891512422399 is 99322421519861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16891512422399 - 2⁸ = 16891512422143 is a prime.

It is a super-4 number, since 4×16891512422399⁴ (a number of 54 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16891512422299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8445756211199 + 8445756211200.

It is an arithmetic number, because the mean of its divisors is an integer number (8445756211200).

Almost surely, 2^{16891512422399} is an apocalyptic number.

16891512422399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16891512422399 is an equidigital number, since it uses as much as digits as its factorization.

16891512422399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16796160, while the sum is 62.

The spelling of 16891512422399 in words is "sixteen trillion, eight hundred ninety-one billion, five hundred twelve million, four hundred twenty-two thousand, three hundred ninety-nine".