1866685056 has 64 divisors (see below), whose sum is σ = 4966012800. Its totient is φ = 621271040.

The previous prime is 1866685033. The next prime is 1866685061. The reversal of 1866685056 is 6505866681.

It is a tau number, because it is divible by the number of its divisors (64).

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, 272716 + ... + 279476.

It is an arithmetic number, because the mean of its divisors is an integer number (77593950).

Almost surely, 2^1866685056 is an apocalyptic number.

1866685056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866685056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2483006400).

1866685056 is an abundant number, since it is smaller than the sum of its proper divisors (3099327744).

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

1866685056 is an equidigital number, since it uses as much as digits as its factorization.

1866685056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7497 (or 7485 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 51.

The square root of 1866685056 is about 43205.1508040419. The cubic root of 1866685056 is about 1231.2805435628.

The spelling of 1866685056 in words is "one billion, eight hundred sixty-six million, six hundred eighty-five thousand, fifty-six".