6440551546 has 32 divisors (see below), whose sum is σ = 11386202688. Its totient is φ = 2693658240.

The previous prime is 6440551529. The next prime is 6440551571. The reversal of 6440551546 is 6451550446.

It is a junction number, because it is equal to n+sod(n) for n = 6440551499 and 6440551508.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 53545 + ... + 125491.

It is an arithmetic number, because the mean of its divisors is an integer number (355818834).

Almost surely, 2^6440551546 is an apocalyptic number.

6440551546 is a deficient number, since it is larger than the sum of its proper divisors (4945651142).

6440551546 is a wasteful number, since it uses less digits than its factorization.

6440551546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72286.

The product of its (nonzero) digits is 288000, while the sum is 40.

The square root of 6440551546 is about 80253.0469577324. The cubic root of 6440551546 is about 1860.5486054682.

The spelling of 6440551546 in words is "six billion, four hundred forty million, five hundred fifty-one thousand, five hundred forty-six".