6699549997 has 4 divisors (see below), whose sum is σ = 7656628576. Its totient is φ = 5742471420.

The previous prime is 6699549979. The next prime is 6699550007. The reversal of 6699549997 is 7999459966.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7999459966 = 2 ⋅3999729983.

It is not a de Polignac number, because 6699549997 - 2¹⁹ = 6699025709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6699519997) 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, 478539279 + ... + 478539292.

It is an arithmetic number, because the mean of its divisors is an integer number (1914157144).

Almost surely, 2^6699549997 is an apocalyptic number.

It is an amenable number.

6699549997 is a deficient number, since it is larger than the sum of its proper divisors (957078579).

6699549997 is an equidigital number, since it uses as much as digits as its factorization.

6699549997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957078578.

The product of its digits is 297606960, while the sum is 73.

The square root of 6699549997 is about 81850.7788417435. The cubic root of 6699549997 is about 1885.1614237432.

The spelling of 6699549997 in words is "six billion, six hundred ninety-nine million, five hundred forty-nine thousand, nine hundred ninety-seven".