645225066 has 24 divisors (see below), whose sum is σ = 1471566720. Its totient is φ = 203755176.

The previous prime is 645225059. The next prime is 645225083. The reversal of 645225066 is 660522546.

645225066 is a `hidden beast` number, since 645 + 2 + 2 + 5 + 0 + 6 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 645225066.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 942970 + ... + 943653.

It is an arithmetic number, because the mean of its divisors is an integer number (61315280).

Almost surely, 2^645225066 is an apocalyptic number.

645225066 is an abundant number, since it is smaller than the sum of its proper divisors (826341654).

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

645225066 is a wasteful number, since it uses less digits than its factorization.

645225066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1886650 (or 1886647 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 645225066 is about 25401.2807944796. The cubic root of 645225066 is about 864.1127440964.

The spelling of 645225066 in words is "six hundred forty-five million, two hundred twenty-five thousand, sixty-six".