6691570409 has 4 divisors (see below), whose sum is σ = 6756537216. Its totient is φ = 6626603604.

The previous prime is 6691570399. The next prime is 6691570411. The reversal of 6691570409 is 9040751966.

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.

It is a cyclic number.

It is not a de Polignac number, because 6691570409 - 2⁸ = 6691570153 is a prime.

It is a super-2 number, since 2×6691570409² = 89554229077208854562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6691570469) 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 3 ways as a sum of consecutive naturals, for example, 32483249 + ... + 32483454.

It is an arithmetic number, because the mean of its divisors is an integer number (1689134304).

Almost surely, 2^6691570409 is an apocalyptic number.

It is an amenable number.

6691570409 is a deficient number, since it is larger than the sum of its proper divisors (64966807).

6691570409 is a wasteful number, since it uses less digits than its factorization.

6691570409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64966806.

The product of its (nonzero) digits is 408240, while the sum is 47.

The square root of 6691570409 is about 81802.0195899832. The cubic root of 6691570409 is about 1884.4126775463.

The spelling of 6691570409 in words is "six billion, six hundred ninety-one million, five hundred seventy thousand, four hundred nine".