16840657344949 has 2 divisors, whose sum is σ = 16840657344950. Its totient is φ = 16840657344948.

The previous prime is 16840657344839. The next prime is 16840657345027. The reversal of 16840657344949 is 94944375604861.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10387116639025 + 6453540705924 = 3222905^2 + 2540382^2 .

It is an emirp because it is prime and its reverse (94944375604861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16840657344949 - 2⁷ = 16840657344821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16840657944949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8420328672474 + 8420328672475.

It is an arithmetic number, because the mean of its divisors is an integer number (8420328672475).

Almost surely, 2^{16840657344949} is an apocalyptic number.

It is an amenable number.

16840657344949 is a deficient number, since it is larger than the sum of its proper divisors (1).

16840657344949 is an equidigital number, since it uses as much as digits as its factorization.

16840657344949 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 627056640, while the sum is 70.

The spelling of 16840657344949 in words is "sixteen trillion, eight hundred forty billion, six hundred fifty-seven million, three hundred forty-four thousand, nine hundred forty-nine".