2011771780 has 12 divisors (see below), whose sum is σ = 4224720780. Its totient is φ = 804708704.

The previous prime is 2011771771. The next prime is 2011771829. The reversal of 2011771780 is 871771102.

It can be written as a sum of positive squares in 2 ways, for example, as 343212676 + 1668559104 = 18526^2 + 40848^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50294275 + ... + 50294314.

It is an arithmetic number, because the mean of its divisors is an integer number (352060065).

Almost surely, 2^2011771780 is an apocalyptic number.

2011771780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2011771780 is an abundant number, since it is smaller than the sum of its proper divisors (2212949000).

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

2011771780 is a wasteful number, since it uses less digits than its factorization.

2011771780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100588598 (or 100588596 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 34.

The square root of 2011771780 is about 44852.7789551551. The cubic root of 2011771780 is about 1262.3881347800.

The spelling of 2011771780 in words is "two billion, eleven million, seven hundred seventy-one thousand, seven hundred eighty".