2181326646 has 16 divisors (see below), whose sum is σ = 4368729600. Its totient is φ = 726096168.

The previous prime is 2181326629. The next prime is 2181326657. The reversal of 2181326646 is 6466231812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248506 + ... + 257133.

It is an arithmetic number, because the mean of its divisors is an integer number (273045600).

Almost surely, 2^2181326646 is an apocalyptic number.

2181326646 is an abundant number, since it is smaller than the sum of its proper divisors (2187402954).

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

2181326646 is a wasteful number, since it uses less digits than its factorization.

2181326646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506363.

The product of its digits is 82944, while the sum is 39.

The square root of 2181326646 is about 46704.6747767287. The cubic root of 2181326646 is about 1296.9012280957.

The spelling of 2181326646 in words is "two billion, one hundred eighty-one million, three hundred twenty-six thousand, six hundred forty-six".