645110667 has 12 divisors (see below), whose sum is σ = 980870280. Its totient is φ = 407438208.

The previous prime is 645110617. The next prime is 645110707. The reversal of 645110667 is 766011546.

645110667 is a `hidden beast` number, since 645 + 1 + 1 + 0 + 6 + 6 + 7 = 666.

It is not a de Polignac number, because 645110667 - 2²⁰ = 644062091 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645110617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1886118 + ... + 1886459.

It is an arithmetic number, because the mean of its divisors is an integer number (81739190).

Almost surely, 2^645110667 is an apocalyptic number.

645110667 is a deficient number, since it is larger than the sum of its proper divisors (335759613).

645110667 is a wasteful number, since it uses less digits than its factorization.

645110667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3772602 (or 3772599 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 645110667 is about 25399.0288593875. The cubic root of 645110667 is about 864.0616717488.

The spelling of 645110667 in words is "six hundred forty-five million, one hundred ten thousand, six hundred sixty-seven".