2180781682 has 4 divisors (see below), whose sum is σ = 3271172526. Its totient is φ = 1090390840.

The previous prime is 2180781671. The next prime is 2180781683. The reversal of 2180781682 is 2861870812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1388978361 + 791803321 = 37269^2 + 28139^2 .

It is not an unprimeable number, because it can be changed into a prime (2180781683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 545195419 + ... + 545195422.

Almost surely, 2^2180781682 is an apocalyptic number.

2180781682 is a deficient number, since it is larger than the sum of its proper divisors (1090390844).

2180781682 is a wasteful number, since it uses less digits than its factorization.

2180781682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090390843.

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 2180781682 is about 46698.8402639723. The cubic root of 2180781682 is about 1296.7932168620.

The spelling of 2180781682 in words is "two billion, one hundred eighty million, seven hundred eighty-one thousand, six hundred eighty-two".