6991338707 has 2 divisors, whose sum is σ = 6991338708. Its totient is φ = 6991338706.

The previous prime is 6991338659. The next prime is 6991338721. The reversal of 6991338707 is 7078331996.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6991338707 - 2¹⁸ = 6991076563 is a prime.

It is not a weakly prime, because it can be changed into another prime (6991338797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3495669353 + 3495669354.

It is an arithmetic number, because the mean of its divisors is an integer number (3495669354).

Almost surely, 2^6991338707 is an apocalyptic number.

6991338707 is a deficient number, since it is larger than the sum of its proper divisors (1).

6991338707 is an equidigital number, since it uses as much as digits as its factorization.

6991338707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1714608, while the sum is 53.

The square root of 6991338707 is about 83614.2255061900. The cubic root of 6991338707 is about 1912.1418829771.

The spelling of 6991338707 in words is "six billion, nine hundred ninety-one million, three hundred thirty-eight thousand, seven hundred seven".