6645880554 has 16 divisors (see below), whose sum is σ = 13379787840. Its totient is φ = 2200622400.

The previous prime is 6645880517. The next prime is 6645880561. The reversal of 6645880554 is 4550885466.

It is a junction number, because it is equal to n+sod(n) for n = 6645880497 and 6645880506.

It is an unprimeable number.

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, 3666799 + ... + 3668610.

It is an arithmetic number, because the mean of its divisors is an integer number (836236740).

Almost surely, 2^6645880554 is an apocalyptic number.

6645880554 is an abundant number, since it is smaller than the sum of its proper divisors (6733907286).

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

6645880554 is a wasteful number, since it uses less digits than its factorization.

6645880554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7335565.

The product of its (nonzero) digits is 4608000, while the sum is 51.

The square root of 6645880554 is about 81522.2702946870. The cubic root of 6645880554 is about 1880.1139732096.

The spelling of 6645880554 in words is "six billion, six hundred forty-five million, eight hundred eighty thousand, five hundred fifty-four".