6643737882 has 16 divisors (see below), whose sum is σ = 14763862080. Its totient is φ = 2214579276.

The previous prime is 6643737851. The next prime is 6643737899. The reversal of 6643737882 is 2887373466.

6643737882 is a `hidden beast` number, since 66 + 437 + 3 + 78 + 82 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 123032183 = 6643737882 / (6 + 6 + 4 + 3 + 7 + 3 + 7 + 8 + 8 + 2).

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, 61516038 + ... + 61516145.

It is an arithmetic number, because the mean of its divisors is an integer number (922741380).

Almost surely, 2^6643737882 is an apocalyptic number.

6643737882 is an abundant number, since it is smaller than the sum of its proper divisors (8120124198).

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

6643737882 is a wasteful number, since it uses less digits than its factorization.

6643737882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123032194 (or 123032188 counting only the distinct ones).

The product of its digits is 8128512, while the sum is 54.

The square root of 6643737882 is about 81509.1275993063. The cubic root of 6643737882 is about 1879.9118981273.

The spelling of 6643737882 in words is "six billion, six hundred forty-three million, seven hundred thirty-seven thousand, eight hundred eighty-two".