6606061666 has 8 divisors (see below), whose sum is σ = 9923818284. Its totient is φ = 3298122240.

The previous prime is 6606061643. The next prime is 6606061681. The reversal of 6606061666 is 6661606066.

It can be written as a sum of positive squares in 2 ways, for example, as 6402400225 + 203661441 = 80015^2 + 14271^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2452615 + ... + 2455306.

Almost surely, 2^6606061666 is an apocalyptic number.

6606061666 is a deficient number, since it is larger than the sum of its proper divisors (3317756618).

6606061666 is a wasteful number, since it uses less digits than its factorization.

6606061666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908596.

The product of its (nonzero) digits is 279936, while the sum is 43.

The square root of 6606061666 is about 81277.6824595780. The cubic root of 6606061666 is about 1876.3515390654.

The spelling of 6606061666 in words is "six billion, six hundred six million, sixty-one thousand, six hundred sixty-six".