7991268869 has 2 divisors, whose sum is σ = 7991268870. Its totient is φ = 7991268868.

The previous prime is 7991268853. The next prime is 7991268899. The reversal of 7991268869 is 9688621997.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7987890625 + 3378244 = 89375^2 + 1838^2 .

It is a cyclic number.

It is not a de Polignac number, because 7991268869 - 2⁴ = 7991268853 is a prime.

It is a super-2 number, since 2×7991268869² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7991268839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3995634434 + 3995634435.

It is an arithmetic number, because the mean of its divisors is an integer number (3995634435).

Almost surely, 2^7991268869 is an apocalyptic number.

It is an amenable number.

7991268869 is a deficient number, since it is larger than the sum of its proper divisors (1).

7991268869 is an equidigital number, since it uses as much as digits as its factorization.

7991268869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23514624, while the sum is 65.

The square root of 7991268869 is about 89393.8972693327. The cubic root of 7991268869 is about 1999.2721408927.

The spelling of 7991268869 in words is "seven billion, nine hundred ninety-one million, two hundred sixty-eight thousand, eight hundred sixty-nine".