6551856388 has 48 divisors (see below), whose sum is σ = 14345662464. Its totient is φ = 2543617440.

The previous prime is 6551856371. The next prime is 6551856403. The reversal of 6551856388 is 8836581556.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49581 + ... + 124747.

It is an arithmetic number, because the mean of its divisors is an integer number (298867968).

Almost surely, 2^6551856388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6551856388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7172831232).

6551856388 is an abundant number, since it is smaller than the sum of its proper divisors (7793806076).

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

6551856388 is a wasteful number, since it uses less digits than its factorization.

6551856388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75472 (or 75470 counting only the distinct ones).

The product of its digits is 6912000, while the sum is 55.

The square root of 6551856388 is about 80943.5382720573. The cubic root of 6551856388 is about 1871.2053757430.

The spelling of 6551856388 in words is "six billion, five hundred fifty-one million, eight hundred fifty-six thousand, three hundred eighty-eight".