6660091820 has 12 divisors (see below), whose sum is σ = 13986192864. Its totient is φ = 2664036720.

The previous prime is 6660091811. The next prime is 6660091859. The reversal of 6660091820 is 281900666.

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, 166502276 + ... + 166502315.

It is an arithmetic number, because the mean of its divisors is an integer number (1165516072).

Almost surely, 2^6660091820 is an apocalyptic number.

It is an amenable number.

6660091820 is an abundant number, since it is smaller than the sum of its proper divisors (7326101044).

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

6660091820 is a wasteful number, since it uses less digits than its factorization.

6660091820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333004600 (or 333004598 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 6660091820 is about 81609.3856121954. The cubic root of 6660091820 is about 1881.4531374924.

The spelling of 6660091820 in words is "six billion, six hundred sixty million, ninety-one thousand, eight hundred twenty".