2605986818 has 6 divisors (see below), whose sum is σ = 3909088521. Its totient is φ = 1302957312.

The previous prime is 2605986809. The next prime is 2605986827. The reversal of 2605986818 is 8186895062.

It is an interprime number because it is at equal distance from previous prime (2605986809) and next prime (2605986827).

It can be written as a sum of positive squares in 2 ways, for example, as 2259766369 + 346220449 = 47537^2 + 18607^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=36097.

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 2605986818.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 54146 + ... + 90242.

Almost surely, 2^2605986818 is an apocalyptic number.

2605986818 is a deficient number, since it is larger than the sum of its proper divisors (1303101703).

2605986818 is an frugal number, since it uses more digits than its factorization.

2605986818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72196 (or 36099 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 53.

The square root of 2605986818 is about 51048.8669609816. The cubic root of 2605986818 is about 1376.1234794458.

The spelling of 2605986818 in words is "two billion, six hundred five million, nine hundred eighty-six thousand, eight hundred eighteen".