6618918980 has 24 divisors (see below), whose sum is σ = 13934758488. Its totient is φ = 2640895488.

The previous prime is 6618918967. The next prime is 6618918997. The reversal of 6618918980 is 898198166.

It can be written as a sum of positive squares in 4 ways, for example, as 499611904 + 6119307076 = 22352^2 + 78226^2 .

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408869 + ... + 424748.

It is an arithmetic number, because the mean of its divisors is an integer number (580614937).

Almost surely, 2^6618918980 is an apocalyptic number.

It is an amenable number.

6618918980 is an abundant number, since it is smaller than the sum of its proper divisors (7315839508).

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

6618918980 is a wasteful number, since it uses less digits than its factorization.

6618918980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834023 (or 834021 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 56.

The square root of 6618918980 is about 81356.7389956112. The cubic root of 6618918980 is about 1877.5680584642.

The spelling of 6618918980 in words is "six billion, six hundred eighteen million, nine hundred eighteen thousand, nine hundred eighty".