16491204277 has 2 divisors, whose sum is σ = 16491204278. Its totient is φ = 16491204276.

The previous prime is 16491204269. The next prime is 16491204287. The reversal of 16491204277 is 77240219461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15797724721 + 693479556 = 125689^2 + 26334^2 .

It is a cyclic number.

It is not a de Polignac number, because 16491204277 - 2³ = 16491204269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16491204287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8245602138 + 8245602139.

It is an arithmetic number, because the mean of its divisors is an integer number (8245602139).

Almost surely, 2^16491204277 is an apocalyptic number.

It is an amenable number.

16491204277 is a deficient number, since it is larger than the sum of its proper divisors (1).

16491204277 is an equidigital number, since it uses as much as digits as its factorization.

16491204277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 43.

The spelling of 16491204277 in words is "sixteen billion, four hundred ninety-one million, two hundred four thousand, two hundred seventy-seven".