645401466 has 16 divisors (see below), whose sum is σ = 1434225600. Its totient is φ = 215133804.

The previous prime is 645401453. The next prime is 645401489. The reversal of 645401466 is 664104546.

645401466 is a `hidden beast` number, since 645 + 4 + 0 + 1 + 4 + 6 + 6 = 666.

645401466 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 645401466.

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, 5975886 + ... + 5975993.

It is an arithmetic number, because the mean of its divisors is an integer number (89639100).

Almost surely, 2^645401466 is an apocalyptic number.

645401466 is an abundant number, since it is smaller than the sum of its proper divisors (788824134).

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

645401466 is a wasteful number, since it uses less digits than its factorization.

645401466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11951890 (or 11951884 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 645401466 is about 25404.7528230447. The cubic root of 645401466 is about 864.1914843723.

The spelling of 645401466 in words is "six hundred forty-five million, four hundred one thousand, four hundred sixty-six".