6555999040 has 56 divisors (see below), whose sum is σ = 16115092992. Its totient is φ = 2537802240.

The previous prime is 6555999029. The next prime is 6555999041. The reversal of 6555999040 is 409995556.

It is a super-2 number, since 2×6555999040² = 85962246824961843200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555999041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320524 + ... + 340363.

Almost surely, 2^6555999040 is an apocalyptic number.

It is an amenable number.

6555999040 is an abundant number, since it is smaller than the sum of its proper divisors (9559093952).

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

6555999040 is a wasteful number, since it uses less digits than its factorization.

6555999040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660935 (or 660925 counting only the distinct ones).

The product of its (nonzero) digits is 2187000, while the sum is 52.

The square root of 6555999040 is about 80969.1239918032. The cubic root of 6555999040 is about 1871.5996721088.

The spelling of 6555999040 in words is "six billion, five hundred fifty-five million, nine hundred ninety-nine thousand, forty".