6697780668 has 72 divisors (see below), whose sum is σ = 17834718720. Its totient is φ = 2113529760.

The previous prime is 6697780633. The next prime is 6697780679. The reversal of 6697780668 is 8660877966.

It is a super-3 number, since 3×6697780668³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1236021 + ... + 1241427.

Almost surely, 2^6697780668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6697780668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8917359360).

6697780668 is an abundant number, since it is smaller than the sum of its proper divisors (11136938052).

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

6697780668 is a wasteful number, since it uses less digits than its factorization.

6697780668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7247 (or 7242 counting only the distinct ones).

The product of its (nonzero) digits is 36578304, while the sum is 63.

The square root of 6697780668 is about 81839.9698680296. The cubic root of 6697780668 is about 1884.9954541656.

The spelling of 6697780668 in words is "six billion, six hundred ninety-seven million, seven hundred eighty thousand, six hundred sixty-eight".