6616861806 has 16 divisors (see below), whose sum is σ = 13234770000. Its totient is φ = 2205446208.

The previous prime is 6616861799. The next prime is 6616861837. The reversal of 6616861806 is 6081686166.

It is a happy number.

It is a congruent number.

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, 56170 + ... + 128018.

It is an arithmetic number, because the mean of its divisors is an integer number (827173125).

Almost surely, 2^6616861806 is an apocalyptic number.

6616861806 is an abundant number, since it is smaller than the sum of its proper divisors (6617908194).

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

6616861806 is a wasteful number, since it uses less digits than its factorization.

6616861806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87203.

The product of its (nonzero) digits is 497664, while the sum is 48.

The square root of 6616861806 is about 81344.0950899326. The cubic root of 6616861806 is about 1877.3735209358.

The spelling of 6616861806 in words is "six billion, six hundred sixteen million, eight hundred sixty-one thousand, eight hundred six".