6421552844 has 12 divisors (see below), whose sum is σ = 12843105744. Its totient is φ = 2752094064.

The previous prime is 6421552771. The next prime is 6421552847. The reversal of 6421552844 is 4482551246.

6421552844 is an admirable number.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (6421552847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114670559 + ... + 114670614.

It is an arithmetic number, because the mean of its divisors is an integer number (1070258812).

Almost surely, 2^6421552844 is an apocalyptic number.

It is an amenable number.

6421552844 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

6421552844 is a wasteful number, since it uses less digits than its factorization.

6421552844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229341184 (or 229341182 counting only the distinct ones).

The product of its digits is 307200, while the sum is 41.

The square root of 6421552844 is about 80134.5920561152. The cubic root of 6421552844 is about 1858.7173532577.

The spelling of 6421552844 in words is "six billion, four hundred twenty-one million, five hundred fifty-two thousand, eight hundred forty-four".