2665623307 has 4 divisors (see below), whose sum is σ = 2822424696. Its totient is φ = 2508821920.

The previous prime is 2665623281. The next prime is 2665623383. The reversal of 2665623307 is 7033265662.

It is a happy number.

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

It is not a de Polignac number, because 2665623307 - 2¹⁵ = 2665590539 is a prime.

It is a super-2 number, since 2×2665623307² = 14211095229643232498, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2665623307.

It is not an unprimeable number, because it can be changed into a prime (2665621307) by changing a digit.

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, 78400669 + ... + 78400702.

It is an arithmetic number, because the mean of its divisors is an integer number (705606174).

Almost surely, 2^2665623307 is an apocalyptic number.

2665623307 is a deficient number, since it is larger than the sum of its proper divisors (156801389).

2665623307 is a wasteful number, since it uses less digits than its factorization.

2665623307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156801388.

The product of its (nonzero) digits is 272160, while the sum is 40.

The square root of 2665623307 is about 51629.6746745513. The cubic root of 2665623307 is about 1386.5416688118.

Adding to 2665623307 its reverse (7033265662), we get a palindrome (9698888969).

The spelling of 2665623307 in words is "two billion, six hundred sixty-five million, six hundred twenty-three thousand, three hundred seven".