2216081777 has 64 divisors (see below), whose sum is σ = 2998464000. Its totient is φ = 1588543488.

The previous prime is 2216081731. The next prime is 2216081783. The reversal of 2216081777 is 7771806122.

It is a de Polignac number, because none of the positive numbers 2^k-2216081777 is a prime.

It is a super-6 number, since 6×2216081777⁶ (a number of 57 digits) contains 666666 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (2216081177) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9677099 + ... + 9677327.

It is an arithmetic number, because the mean of its divisors is an integer number (46851000).

Almost surely, 2^2216081777 is an apocalyptic number.

It is an amenable number.

2216081777 is a deficient number, since it is larger than the sum of its proper divisors (782382223).

2216081777 is a wasteful number, since it uses less digits than its factorization.

2216081777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

The product of its (nonzero) digits is 65856, while the sum is 41.

The square root of 2216081777 is about 47075.2777686972. The cubic root of 2216081777 is about 1303.7528200942.

Adding to 2216081777 its reverse (7771806122), we get a palindrome (9987887899).

The spelling of 2216081777 in words is "two billion, two hundred sixteen million, eighty-one thousand, seven hundred seventy-seven".