6551239820 has 12 divisors (see below), whose sum is σ = 13757603664. Its totient is φ = 2620495920.

The previous prime is 6551239819. The next prime is 6551239823. The reversal of 6551239820 is 289321556.

It is not an unprimeable number, because it can be changed into a prime (6551239823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163780976 + ... + 163781015.

It is an arithmetic number, because the mean of its divisors is an integer number (1146466972).

Almost surely, 2^6551239820 is an apocalyptic number.

It is an amenable number.

6551239820 is an abundant number, since it is smaller than the sum of its proper divisors (7206363844).

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

6551239820 is a wasteful number, since it uses less digits than its factorization.

6551239820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327562000 (or 327561998 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 41.

The square root of 6551239820 is about 80939.7295523033. The cubic root of 6551239820 is about 1871.1466767789.

The spelling of 6551239820 in words is "six billion, five hundred fifty-one million, two hundred thirty-nine thousand, eight hundred twenty".