1816666656 has 48 divisors (see below), whose sum is σ = 5450001984. Its totient is φ = 519047424.

The previous prime is 1816666603. The next prime is 1816666669. The reversal of 1816666656 is 6566666181.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 1816666599 and 1816666608.

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, 1351015 + ... + 1352358.

It is an arithmetic number, because the mean of its divisors is an integer number (113541708).

Almost surely, 2^1816666656 is an apocalyptic number.

1816666656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1816666656 is an abundant number, since it is smaller than the sum of its proper divisors (3633335328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1816666656 is a wasteful number, since it uses less digits than its factorization.

1816666656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2703393 (or 2703385 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 51.

The square root of 1816666656 is about 42622.3727166848. The cubic root of 1816666656 is about 1220.1833138501.

The spelling of 1816666656 in words is "one billion, eight hundred sixteen million, six hundred sixty-six thousand, six hundred fifty-six".