6691578466 has 4 divisors (see below), whose sum is σ = 10037367702. Its totient is φ = 3345789232.

The previous prime is 6691578457. The next prime is 6691578497. The reversal of 6691578466 is 6648751966.

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

It can be written as a sum of positive squares in only one way, i.e., 6688786225 + 2792241 = 81785^2 + 1671^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6691578466.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1672894615 + ... + 1672894618.

Almost surely, 2^6691578466 is an apocalyptic number.

6691578466 is a deficient number, since it is larger than the sum of its proper divisors (3345789236).

6691578466 is a wasteful number, since it uses less digits than its factorization.

6691578466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3345789235.

The product of its digits is 13063680, while the sum is 58.

The square root of 6691578466 is about 81802.0688369188. The cubic root of 6691578466 is about 1884.4134338564.

The spelling of 6691578466 in words is "six billion, six hundred ninety-one million, five hundred seventy-eight thousand, four hundred sixty-six".