16497197819 has 2 divisors, whose sum is σ = 16497197820. Its totient is φ = 16497197818.

The previous prime is 16497197789. The next prime is 16497197891. The reversal of 16497197819 is 91879179461.

Together with next prime (16497197891) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (91879179461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16497197819 is a prime.

It is a super-2 number, since 2×16497197819² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16497191819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8248598909 + 8248598910.

It is an arithmetic number, because the mean of its divisors is an integer number (8248598910).

Almost surely, 2^16497197819 is an apocalyptic number.

16497197819 is a deficient number, since it is larger than the sum of its proper divisors (1).

16497197819 is an equidigital number, since it uses as much as digits as its factorization.

16497197819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6858432, while the sum is 62.

The spelling of 16497197819 in words is "sixteen billion, four hundred ninety-seven million, one hundred ninety-seven thousand, eight hundred nineteen".