6691099597 has 30 divisors (see below), whose sum is σ = 8424461262. Its totient is φ = 5282622576.

The previous prime is 6691099589. The next prime is 6691099601. The reversal of 6691099597 is 7959901966.

It can be written as a sum of positive squares in only one way, i.e., 4632299721 + 2058799876 = 68061^2 + 45374^2 .

It is not a de Polignac number, because 6691099597 - 2³ = 6691099589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691099507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 14451388 + ... + 14451850.

Almost surely, 2^6691099597 is an apocalyptic number.

It is an amenable number.

6691099597 is a deficient number, since it is larger than the sum of its proper divisors (1733361665).

6691099597 is an frugal number, since it uses more digits than its factorization.

6691099597 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 8266860, while the sum is 61.

The square root of 6691099597 is about 81799.1417864515. The cubic root of 6691099597 is about 1884.3684813982.

The spelling of 6691099597 in words is "six billion, six hundred ninety-one million, ninety-nine thousand, five hundred ninety-seven".