1816556546 has 16 divisors (see below), whose sum is σ = 3166879680. Its totient is φ = 765328560.

The previous prime is 1816556531. The next prime is 1816556561. The reversal of 1816556546 is 6456556181.

It is an interprime number because it is at equal distance from previous prime (1816556531) and next prime (1816556561).

It is a self number, because there is not a number n which added to its sum of digits gives 1816556546.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1098785 + ... + 1100436.

It is an arithmetic number, because the mean of its divisors is an integer number (197929980).

Almost surely, 2^1816556546 is an apocalyptic number.

1816556546 is a deficient number, since it is larger than the sum of its proper divisors (1350323134).

1816556546 is a wasteful number, since it uses less digits than its factorization.

1816556546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199289.

The product of its digits is 864000, while the sum is 47.

The square root of 1816556546 is about 42621.0810045921. The cubic root of 1816556546 is about 1220.1586611712.

The spelling of 1816556546 in words is "one billion, eight hundred sixteen million, five hundred fifty-six thousand, five hundred forty-six".