6687771145 has 32 divisors (see below), whose sum is σ = 9229409280. Its totient is φ = 4600981440.

The previous prime is 6687771137. The next prime is 6687771161. The reversal of 6687771145 is 5411777866.

It is a happy number.

It is not a de Polignac number, because 6687771145 - 2³ = 6687771137 is a prime.

It is a super-2 number, since 2×6687771145² = 89452565775789222050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 6687771092 and 6687771101.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 755314 + ... + 764116.

It is an arithmetic number, because the mean of its divisors is an integer number (288419040).

Almost surely, 2^6687771145 is an apocalyptic number.

It is an amenable number.

6687771145 is a deficient number, since it is larger than the sum of its proper divisors (2541638135).

6687771145 is a wasteful number, since it uses less digits than its factorization.

6687771145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9565.

The product of its digits is 1975680, while the sum is 52.

The square root of 6687771145 is about 81778.7939810804. The cubic root of 6687771145 is about 1884.0559732057.

The spelling of 6687771145 in words is "six billion, six hundred eighty-seven million, seven hundred seventy-one thousand, one hundred forty-five".