645466818 has 16 divisors (see below), whose sum is σ = 1291681440. Its totient is φ = 215030976.

The previous prime is 645466793. The next prime is 645466837. The reversal of 645466818 is 818664546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19608 + ... + 40931.

It is an arithmetic number, because the mean of its divisors is an integer number (80730090).

Almost surely, 2^645466818 is an apocalyptic number.

645466818 is an abundant number, since it is smaller than the sum of its proper divisors (646214622).

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

645466818 is a wasteful number, since it uses less digits than its factorization.

645466818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62321.

The product of its digits is 1105920, while the sum is 48.

The square root of 645466818 is about 25406.0390065039. The cubic root of 645466818 is about 864.2206521275.

The spelling of 645466818 in words is "six hundred forty-five million, four hundred sixty-six thousand, eight hundred eighteen".