6680699890 has 8 divisors (see below), whose sum is σ = 12025259820. Its totient is φ = 2672279952.

The previous prime is 6680699887. The next prime is 6680699891. The reversal of 6680699890 is 989960866.

It can be written as a sum of positive squares in 2 ways, for example, as 6624494881 + 56205009 = 81391^2 + 7497^2 .

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

It is not an unprimeable number, because it can be changed into a prime (6680699891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 334034985 + ... + 334035004.

Almost surely, 2^6680699890 is an apocalyptic number.

6680699890 is a deficient number, since it is larger than the sum of its proper divisors (5344559930).

6680699890 is a wasteful number, since it uses less digits than its factorization.

6680699890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668069996.

The product of its (nonzero) digits is 10077696, while the sum is 61.

The square root of 6680699890 is about 81735.5485085896. The cubic root of 6680699890 is about 1883.3917091224.

The spelling of 6680699890 in words is "six billion, six hundred eighty million, six hundred ninety-nine thousand, eight hundred ninety".