6899724959 has 2 divisors, whose sum is σ = 6899724960. Its totient is φ = 6899724958.

The previous prime is 6899724947. The next prime is 6899724967. The reversal of 6899724959 is 9594279986.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6899724959 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6899714959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3449862479 + 3449862480.

It is an arithmetic number, because the mean of its divisors is an integer number (3449862480).

Almost surely, 2^6899724959 is an apocalyptic number.

6899724959 is a deficient number, since it is larger than the sum of its proper divisors (1).

6899724959 is an equidigital number, since it uses as much as digits as its factorization.

6899724959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 88179840, while the sum is 68.

The square root of 6899724959 is about 83064.5830604115. The cubic root of 6899724959 is about 1903.7529661162.

The spelling of 6899724959 in words is "six billion, eight hundred ninety-nine million, seven hundred twenty-four thousand, nine hundred fifty-nine".