6691863247 has 2 divisors, whose sum is σ = 6691863248. Its totient is φ = 6691863246.

The previous prime is 6691863197. The next prime is 6691863287. The reversal of 6691863247 is 7423681966.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6691863247 is a prime.

It is a super-3 number, since 3×6691863247³ (a number of 30 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6691863194 and 6691863203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6691863287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345931623 + 3345931624.

It is an arithmetic number, because the mean of its divisors is an integer number (3345931624).

Almost surely, 2^6691863247 is an apocalyptic number.

6691863247 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691863247 is an equidigital number, since it uses as much as digits as its factorization.

6691863247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 52.

The square root of 6691863247 is about 81803.8094895342. The cubic root of 6691863247 is about 1884.4401658416.

The spelling of 6691863247 in words is "six billion, six hundred ninety-one million, eight hundred sixty-three thousand, two hundred forty-seven".