6620865876 has 18 divisors (see below), whose sum is σ = 16736077722. Its totient is φ = 2206955280.

The previous prime is 6620865871. The next prime is 6620865887. The reversal of 6620865876 is 6785680266.

6620865876 is a `hidden beast` number, since 6 + 620 + 8 + 6 + 5 + 8 + 7 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6468984900 + 151880976 = 80430^2 + 12324^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6620865871) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 91956435 + ... + 91956506.

Almost surely, 2^6620865876 is an apocalyptic number.

It is an amenable number.

6620865876 is an abundant number, since it is smaller than the sum of its proper divisors (10115211846).

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

6620865876 is a wasteful number, since it uses less digits than its factorization.

6620865876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183912951 (or 183912946 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The square root of 6620865876 is about 81368.7032955546. The cubic root of 6620865876 is about 1877.7521303853.

The spelling of 6620865876 in words is "six billion, six hundred twenty million, eight hundred sixty-five thousand, eight hundred seventy-six".