6660043554 has 16 divisors (see below), whose sum is σ = 13336281792. Its totient is φ = 2217315408.

The previous prime is 6660043499. The next prime is 6660043561. The reversal of 6660043554 is 4553400666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 669429 + ... + 679304.

It is an arithmetic number, because the mean of its divisors is an integer number (833517612).

Almost surely, 2^6660043554 is an apocalyptic number.

6660043554 is an abundant number, since it is smaller than the sum of its proper divisors (6676238238).

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

6660043554 is a wasteful number, since it uses less digits than its factorization.

6660043554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349561.

The product of its (nonzero) digits is 259200, while the sum is 39.

The square root of 6660043554 is about 81609.0898981235. The cubic root of 6660043554 is about 1881.4485924881.

The spelling of 6660043554 in words is "six billion, six hundred sixty million, forty-three thousand, five hundred fifty-four".