6555921944 has 32 divisors (see below), whose sum is σ = 14441369040. Its totient is φ = 2750736000.

The previous prime is 6555921929. The next prime is 6555921949. The reversal of 6555921944 is 4491295556.

It is a happy number.

It is a super-2 number, since 2×6555921944² = 85960225071641478272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6555921892 and 6555921901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555921949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2864207 + ... + 2866494.

Almost surely, 2^6555921944 is an apocalyptic number.

It is an amenable number.

6555921944 is an abundant number, since it is smaller than the sum of its proper divisors (7885447096).

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

6555921944 is a wasteful number, since it uses less digits than its factorization.

6555921944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5730731 (or 5730727 counting only the distinct ones).

The product of its digits is 1944000, while the sum is 50.

The square root of 6555921944 is about 80968.6479076933. The cubic root of 6555921944 is about 1871.5923356519.

The spelling of 6555921944 in words is "six billion, five hundred fifty-five million, nine hundred twenty-one thousand, nine hundred forty-four".