6691152257 has 2 divisors, whose sum is σ = 6691152258. Its totient is φ = 6691152256.

The previous prime is 6691152217. The next prime is 6691152263. The reversal of 6691152257 is 7522511966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6653501761 + 37650496 = 81569^2 + 6136^2 .

It is a cyclic number.

It is not a de Polignac number, because 6691152257 - 2⁸ = 6691152001 is a prime.

It is not a weakly prime, because it can be changed into another prime (6691152217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3345576128 + 3345576129.

It is an arithmetic number, because the mean of its divisors is an integer number (3345576129).

Almost surely, 2^6691152257 is an apocalyptic number.

It is an amenable number.

6691152257 is a deficient number, since it is larger than the sum of its proper divisors (1).

6691152257 is an equidigital number, since it uses as much as digits as its factorization.

6691152257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 6691152257 is about 81799.4636718359. The cubic root of 6691152257 is about 1884.3734248101.

The spelling of 6691152257 in words is "six billion, six hundred ninety-one million, one hundred fifty-two thousand, two hundred fifty-seven".