2689023665 has 4 divisors (see below), whose sum is σ = 3226828404. Its totient is φ = 2151218928.

The previous prime is 2689023653. The next prime is 2689023691. The reversal of 2689023665 is 5663209862.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1060739761 + 1628283904 = 32569^2 + 40352^2 .

It is a cyclic number.

It is not a de Polignac number, because 2689023665 - 2¹⁸ = 2688761521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268902362 + ... + 268902371.

It is an arithmetic number, because the mean of its divisors is an integer number (806707101).

Almost surely, 2^2689023665 is an apocalyptic number.

It is an amenable number.

2689023665 is a deficient number, since it is larger than the sum of its proper divisors (537804739).

2689023665 is an equidigital number, since it uses as much as digits as its factorization.

2689023665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537804738.

The product of its (nonzero) digits is 933120, while the sum is 47.

The square root of 2689023665 is about 51855.7968312126. The cubic root of 2689023665 is about 1390.5871378759.

The spelling of 2689023665 in words is "two billion, six hundred eighty-nine million, twenty-three thousand, six hundred sixty-five".