2213981665 has 16 divisors (see below), whose sum is σ = 3038519808. Its totient is φ = 1517057856.

The previous prime is 2213981647. The next prime is 2213981677. The reversal of 2213981665 is 5661893122.

It is a cyclic number.

It is not a de Polignac number, because 2213981665 - 2⁷ = 2213981537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27579 + ... + 72031.

It is an arithmetic number, because the mean of its divisors is an integer number (189907488).

Almost surely, 2^2213981665 is an apocalyptic number.

It is an amenable number.

2213981665 is a deficient number, since it is larger than the sum of its proper divisors (824538143).

2213981665 is a wasteful number, since it uses less digits than its factorization.

2213981665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45888.

The product of its digits is 155520, while the sum is 43.

The square root of 2213981665 is about 47052.9665908538. The cubic root of 2213981665 is about 1303.3408478856.

The spelling of 2213981665 in words is "two billion, two hundred thirteen million, nine hundred eighty-one thousand, six hundred sixty-five".