6691139670 has 16 divisors (see below), whose sum is σ = 16058735280. Its totient is φ = 1784303904.

The previous prime is 6691139647. The next prime is 6691139671. The reversal of 6691139670 is 769311966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691139671) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111518965 + ... + 111519024.

It is an arithmetic number, because the mean of its divisors is an integer number (1003670955).

Almost surely, 2^6691139670 is an apocalyptic number.

6691139670 is an abundant number, since it is smaller than the sum of its proper divisors (9367595610).

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

6691139670 is a wasteful number, since it uses less digits than its factorization.

6691139670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223037999.

The product of its (nonzero) digits is 367416, while the sum is 48.

The square root of 6691139670 is about 81799.3867336424. The cubic root of 6691139670 is about 1884.3722432188.

The spelling of 6691139670 in words is "six billion, six hundred ninety-one million, one hundred thirty-nine thousand, six hundred seventy".