2663361665 has 8 divisors (see below), whose sum is σ = 3198498408. Its totient is φ = 2129046400.

The previous prime is 2663361647. The next prime is 2663361667. The reversal of 2663361665 is 5661633662.

It can be written as a sum of positive squares in 4 ways, for example, as 109474369 + 2553887296 = 10463^2 + 50536^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2663361665 - 2⁶ = 2663361601 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2663361667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198212 + ... + 211221.

It is an arithmetic number, because the mean of its divisors is an integer number (399812301).

Almost surely, 2^2663361665 is an apocalyptic number.

It is an amenable number.

2663361665 is a deficient number, since it is larger than the sum of its proper divisors (535136743).

2663361665 is a wasteful number, since it uses less digits than its factorization.

2663361665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410739.

The product of its digits is 699840, while the sum is 44.

The square root of 2663361665 is about 51607.7674870750. The cubic root of 2663361665 is about 1386.1494218210.

The spelling of 2663361665 in words is "two billion, six hundred sixty-three million, three hundred sixty-one thousand, six hundred sixty-five".