6618081820 has 48 divisors (see below), whose sum is σ = 16107130368. Its totient is φ = 2237094720.

The previous prime is 6618081817. The next prime is 6618081829. The reversal of 6618081820 is 281808166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6618081829) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 322962 + ... + 342841.

It is an arithmetic number, because the mean of its divisors is an integer number (335565216).

Almost surely, 2^6618081820 is an apocalyptic number.

It is an amenable number.

6618081820 is an abundant number, since it is smaller than the sum of its proper divisors (9489048548).

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

6618081820 is a wasteful number, since it uses less digits than its factorization.

6618081820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665890 (or 665888 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 6618081820 is about 81351.5938381050. The cubic root of 6618081820 is about 1877.4888969398.

Adding to 6618081820 its reverse (281808166), we get a palindrome (6899889986).

The spelling of 6618081820 in words is "six billion, six hundred eighteen million, eighty-one thousand, eight hundred twenty".