2685193865 has 4 divisors (see below), whose sum is σ = 3222232644. Its totient is φ = 2148155088.

The previous prime is 2685193793. The next prime is 2685193873. The reversal of 2685193865 is 5683915862.

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 1068832249 + 1616361616 = 32693^2 + 40204^2 .

It is a cyclic number.

It is not a de Polignac number, because 2685193865 - 2¹⁸ = 2684931721 is a prime.

It is a Duffinian 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, 268519382 + ... + 268519391.

It is an arithmetic number, because the mean of its divisors is an integer number (805558161).

Almost surely, 2^2685193865 is an apocalyptic number.

It is an amenable number.

2685193865 is a deficient number, since it is larger than the sum of its proper divisors (537038779).

2685193865 is an equidigital number, since it uses as much as digits as its factorization.

2685193865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537038778.

The product of its digits is 3110400, while the sum is 53.

The square root of 2685193865 is about 51818.8562687368. The cubic root of 2685193865 is about 1389.9266502019.

The spelling of 2685193865 in words is "two billion, six hundred eighty-five million, one hundred ninety-three thousand, eight hundred sixty-five".