44661221613 has 32 divisors (see below), whose sum is σ = 66914023680. Its totient is φ = 29437819200.

The previous prime is 44661221587. The next prime is 44661221621. The reversal of 44661221613 is 31612216644.

44661221613 is a `hidden beast` number, since 4 + 4 + 6 + 6 + 12 + 21 + 613 = 666.

It is not a de Polignac number, because 44661221613 - 2⁸ = 44661221357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44661221663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1987720 + ... + 2010062.

It is an arithmetic number, because the mean of its divisors is an integer number (2091063240).

Almost surely, 2^44661221613 is an apocalyptic number.

It is an amenable number.

44661221613 is a deficient number, since it is larger than the sum of its proper divisors (22252802067).

44661221613 is a wasteful number, since it uses less digits than its factorization.

44661221613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23186 (or 23180 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The spelling of 44661221613 in words is "forty-four billion, six hundred sixty-one million, two hundred twenty-one thousand, six hundred thirteen".