2181946776 has 64 divisors (see below), whose sum is σ = 5940000000. Its totient is φ = 665271936.

The previous prime is 2181946769. The next prime is 2181946777. The reversal of 2181946776 is 6776491812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2181946777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69276 + ... + 95723.

It is an arithmetic number, because the mean of its divisors is an integer number (92812500).

Almost surely, 2^2181946776 is an apocalyptic number.

It is an amenable number.

2181946776 is an abundant number, since it is smaller than the sum of its proper divisors (3758053224).

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

2181946776 is a wasteful number, since it uses less digits than its factorization.

2181946776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165056 (or 165052 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 51.

The square root of 2181946776 is about 46711.3131478874. The cubic root of 2181946776 is about 1297.0241152630.

The spelling of 2181946776 in words is "two billion, one hundred eighty-one million, nine hundred forty-six thousand, seven hundred seventy-six".