16644844660 has 12 divisors (see below), whose sum is σ = 34954173828. Its totient is φ = 6657937856.

The previous prime is 16644844627. The next prime is 16644844681. The reversal of 16644844660 is 6644844661.

It can be written as a sum of positive squares in 2 ways, for example, as 5256540004 + 11388304656 = 72502^2 + 106716^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416121097 + ... + 416121136.

It is an arithmetic number, because the mean of its divisors is an integer number (2912847819).

Almost surely, 2^16644844660 is an apocalyptic number.

16644844660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16644844660 is an abundant number, since it is smaller than the sum of its proper divisors (18309329168).

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

16644844660 is a wasteful number, since it uses less digits than its factorization.

16644844660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 832242242 (or 832242240 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 49.

Subtracting from 16644844660 its reverse (6644844661), we obtain a palindrome (9999999999).

The spelling of 16644844660 in words is "sixteen billion, six hundred forty-four million, eight hundred forty-four thousand, six hundred sixty".