6687771251 has 8 divisors (see below), whose sum is σ = 7647045120. Its totient is φ = 5729466888.

The previous prime is 6687771187. The next prime is 6687771263. The reversal of 6687771251 is 1521777866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6687771251 - 2⁶ = 6687771187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6687771251.

It is not an unprimeable number, because it can be changed into a prime (6687771281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 227531 + ... + 255236.

It is an arithmetic number, because the mean of its divisors is an integer number (955880640).

Almost surely, 2^6687771251 is an apocalyptic number.

6687771251 is a deficient number, since it is larger than the sum of its proper divisors (959273869).

6687771251 is a wasteful number, since it uses less digits than its factorization.

6687771251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484753.

The product of its digits is 987840, while the sum is 50.

The square root of 6687771251 is about 81778.7946291702. The cubic root of 6687771251 is about 1884.0559831597.

The spelling of 6687771251 in words is "six billion, six hundred eighty-seven million, seven hundred seventy-one thousand, two hundred fifty-one".