645042366 has 60 divisors (see below), whose sum is σ = 1468921608. Its totient is φ = 211566168.

The previous prime is 645042361. The next prime is 645042367. The reversal of 645042366 is 663240546.

645042366 is a `hidden beast` number, since 645 + 0 + 4 + 2 + 3 + 6 + 6 = 666.

645042366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645042366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645042361) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 726775 + ... + 727661.

Almost surely, 2^645042366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645042366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734460804).

645042366 is an abundant number, since it is smaller than the sum of its proper divisors (823879242).

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

645042366 is an equidigital number, since it uses as much as digits as its factorization.

645042366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1035 (or 959 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 36.

The square root of 645042366 is about 25397.6842645151. The cubic root of 645042366 is about 864.0311765371.

The spelling of 645042366 in words is "six hundred forty-five million, forty-two thousand, three hundred sixty-six".