6687997794 has 20 divisors (see below), whose sum is σ = 14986069494. Its totient is φ = 2229332544.

The previous prime is 6687997787. The next prime is 6687997801. The reversal of 6687997794 is 4977997866.

It is an interprime number because it is at equal distance from previous prime (6687997787) and next prime (6687997801).

It can be written as a sum of positive squares in only one way, i.e., 6597500625 + 90497169 = 81225^2 + 9513^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 20641807 + ... + 20642130.

Almost surely, 2^6687997794 is an apocalyptic number.

6687997794 is an abundant number, since it is smaller than the sum of its proper divisors (8298071700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6687997794 is a wasteful number, since it uses less digits than its factorization.

6687997794 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41283951 (or 41283942 counting only the distinct ones).

The product of its digits is 288054144, while the sum is 72.

The square root of 6687997794 is about 81780.1797136690. The cubic root of 6687997794 is about 1884.0772565585.

Adding to 6687997794 its sum of digits (72), we get a palindrome (6687997866).

The spelling of 6687997794 in words is "six billion, six hundred eighty-seven million, nine hundred ninety-seven thousand, seven hundred ninety-four".