6601855866 has 8 divisors (see below), whose sum is σ = 13203711744. Its totient is φ = 2200618620.

The previous prime is 6601855847. The next prime is 6601855877. The reversal of 6601855866 is 6685581066.

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

6601855866 is an admirable number.

It is a Curzon number.

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, 550154650 + ... + 550154661.

It is an arithmetic number, because the mean of its divisors is an integer number (1650463968).

Almost surely, 2^6601855866 is an apocalyptic number.

6601855866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6601855866 is a wasteful number, since it uses less digits than its factorization.

6601855866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100309316.

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 6601855866 is about 81251.8053091745. The cubic root of 6601855866 is about 1875.9532566477.

The spelling of 6601855866 in words is "six billion, six hundred one million, eight hundred fifty-five thousand, eight hundred sixty-six".