6666930691 has 4 divisors (see below), whose sum is σ = 7017821800. Its totient is φ = 6316039584.

The previous prime is 6666930689. The next prime is 6666930707. The reversal of 6666930691 is 1960396666.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6666930691 - 2¹ = 6666930689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666934691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175445526 + ... + 175445563.

It is an arithmetic number, because the mean of its divisors is an integer number (1754455450).

Almost surely, 2^6666930691 is an apocalyptic number.

6666930691 is a deficient number, since it is larger than the sum of its proper divisors (350891109).

6666930691 is a wasteful number, since it uses less digits than its factorization.

6666930691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350891108.

The product of its (nonzero) digits is 1889568, while the sum is 52.

The square root of 6666930691 is about 81651.2748890059. The cubic root of 6666930691 is about 1882.0969030751.

The spelling of 6666930691 in words is "six billion, six hundred sixty-six million, nine hundred thirty thousand, six hundred ninety-one".