6660404056 has 64 divisors (see below), whose sum is σ = 12828170880. Its totient is φ = 3241217280.

The previous prime is 6660404029. The next prime is 6660404083. The reversal of 6660404056 is 6504040666.

It is an interprime number because it is at equal distance from previous prime (6660404029) and next prime (6660404083).

It is a super-2 number, since 2×6660404056² = 88721964378362502272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19194075 + ... + 19194421.

It is an arithmetic number, because the mean of its divisors is an integer number (200440170).

Almost surely, 2^6660404056 is an apocalyptic number.

It is an amenable number.

6660404056 is a deficient number, since it is larger than the sum of its proper divisors (6167766824).

6660404056 is a wasteful number, since it uses less digits than its factorization.

6660404056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 6660404056 is about 81611.2985805274. The cubic root of 6660404056 is about 1881.4825388999.

The spelling of 6660404056 in words is "six billion, six hundred sixty million, four hundred four thousand, fifty-six".