6981709899553 has 2 divisors, whose sum is σ = 6981709899554. Its totient is φ = 6981709899552.

The previous prime is 6981709899517. The next prime is 6981709899599. The reversal of 6981709899553 is 3559989071896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6313621086864 + 668088812689 = 2512692^2 + 817367^2 .

It is a cyclic number.

It is not a de Polignac number, because 6981709899553 - 2¹³ = 6981709891361 is a prime.

It is a super-2 number, since 2×6981709899553² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6981709899653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3490854949776 + 3490854949777.

It is an arithmetic number, because the mean of its divisors is an integer number (3490854949777).

Almost surely, 2^{6981709899553} is an apocalyptic number.

It is an amenable number.

6981709899553 is a deficient number, since it is larger than the sum of its proper divisors (1).

6981709899553 is an equidigital number, since it uses as much as digits as its factorization.

6981709899553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1322697600, while the sum is 79.

The spelling of 6981709899553 in words is "six trillion, nine hundred eighty-one billion, seven hundred nine million, eight hundred ninety-nine thousand, five hundred fifty-three".