6991016797 has 2 divisors, whose sum is σ = 6991016798. Its totient is φ = 6991016796.

The previous prime is 6991016789. The next prime is 6991016803. The reversal of 6991016797 is 7976101996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6452266276 + 538750521 = 80326^2 + 23211^2 .

It is a cyclic number.

It is not a de Polignac number, because 6991016797 - 2³ = 6991016789 is a prime.

It is a super-2 number, since 2×6991016797² = 97748631711872278418, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6991016737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495508398 + 3495508399.

It is an arithmetic number, because the mean of its divisors is an integer number (3495508399).

Almost surely, 2^6991016797 is an apocalyptic number.

It is an amenable number.

6991016797 is a deficient number, since it is larger than the sum of its proper divisors (1).

6991016797 is an equidigital number, since it uses as much as digits as its factorization.

6991016797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1285956, while the sum is 55.

The square root of 6991016797 is about 83612.3005125442. The cubic root of 6991016797 is about 1912.1125349001.

The spelling of 6991016797 in words is "six billion, nine hundred ninety-one million, sixteen thousand, seven hundred ninety-seven".