6687681412 has 6 divisors (see below), whose sum is σ = 11703442478. Its totient is φ = 3343840704.

The previous prime is 6687681397. The next prime is 6687681419. The reversal of 6687681412 is 2141867866.

It can be written as a sum of positive squares in only one way, i.e., 6687314176 + 367236 = 81776^2 + 606^2 .

It is not an unprimeable number, because it can be changed into a prime (6687681419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835960173 + ... + 835960180.

Almost surely, 2^6687681412 is an apocalyptic number.

It is an amenable number.

6687681412 is a deficient number, since it is larger than the sum of its proper divisors (5015761066).

6687681412 is a wasteful number, since it uses less digits than its factorization.

6687681412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1671920357 (or 1671920355 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

The square root of 6687681412 is about 81778.2453467913. The cubic root of 6687681412 is about 1884.0475467435.

The spelling of 6687681412 in words is "six billion, six hundred eighty-seven million, six hundred eighty-one thousand, four hundred twelve".