1816257868 has 12 divisors (see below), whose sum is σ = 3196209240. Its totient is φ = 903055232.

The previous prime is 1816257857. The next prime is 1816257871. The reversal of 1816257868 is 8687526181.

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, 1267621 + ... + 1269052.

It is an arithmetic number, because the mean of its divisors is an integer number (266350770).

Almost surely, 2^1816257868 is an apocalyptic number.

It is an amenable number.

1816257868 is a deficient number, since it is larger than the sum of its proper divisors (1379951372).

1816257868 is a wasteful number, since it uses less digits than its factorization.

1816257868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2536856 (or 2536854 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 52.

The square root of 1816257868 is about 42617.5769841506. The cubic root of 1816257868 is about 1220.0917847276.

The spelling of 1816257868 in words is "one billion, eight hundred sixteen million, two hundred fifty-seven thousand, eight hundred sixty-eight".