1816645608 has 96 divisors (see below), whose sum is σ = 5139763200. Its totient is φ = 578922624.

The previous prime is 1816645603. The next prime is 1816645609. The reversal of 1816645608 is 8065466181.

1816645608 is a `hidden beast` number, since 1 + 81 + 6 + 6 + 4 + 560 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1816645603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 210841 + ... + 219287.

It is an arithmetic number, because the mean of its divisors is an integer number (53539200).

Almost surely, 2^1816645608 is an apocalyptic number.

1816645608 is a gapful number since it is divisible by the number (18) 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 1816645608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2569881600).

1816645608 is an abundant number, since it is smaller than the sum of its proper divisors (3323117592).

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

1816645608 is a wasteful number, since it uses less digits than its factorization.

1816645608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591 (or 8584 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 1816645608 is about 42622.1258033900. The cubic root of 1816645608 is about 1220.1786014615.

The spelling of 1816645608 in words is "one billion, eight hundred sixteen million, six hundred forty-five thousand, six hundred eight".