2685517649 has 4 divisors (see below), whose sum is σ = 2722305636. Its totient is φ = 2648729664.

The previous prime is 2685517633. The next prime is 2685517673. The reversal of 2685517649 is 9467155862.

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 1669948225 + 1015569424 = 40865^2 + 31868^2 .

It is not a de Polignac number, because 2685517649 - 2⁴ = 2685517633 is a prime.

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 2685517649.

It is not an unprimeable number, because it can be changed into a prime (2685517699) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18393884 + ... + 18394029.

It is an arithmetic number, because the mean of its divisors is an integer number (680576409).

Almost surely, 2^2685517649 is an apocalyptic number.

It is an amenable number.

2685517649 is a deficient number, since it is larger than the sum of its proper divisors (36787987).

2685517649 is an equidigital number, since it uses as much as digits as its factorization.

2685517649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36787986.

The product of its digits is 3628800, while the sum is 53.

The square root of 2685517649 is about 51821.9803654781. The cubic root of 2685517649 is about 1389.9825143152.

The spelling of 2685517649 in words is "two billion, six hundred eighty-five million, five hundred seventeen thousand, six hundred forty-nine".