645649695 has 12 divisors (see below), whose sum is σ = 1119126216. Its totient is φ = 344346480.

The previous prime is 645649691. The next prime is 645649709. The reversal of 645649695 is 596946546.

645649695 is a `hidden beast` number, since 64 + 5 + 6 + 496 + 95 = 666.

It is not a de Polignac number, because 645649695 - 2² = 645649691 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645649691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7173841 + ... + 7173930.

It is an arithmetic number, because the mean of its divisors is an integer number (93260518).

Almost surely, 2^645649695 is an apocalyptic number.

645649695 is a deficient number, since it is larger than the sum of its proper divisors (473476521).

645649695 is a wasteful number, since it uses less digits than its factorization.

645649695 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14347782 (or 14347779 counting only the distinct ones).

The product of its digits is 6998400, while the sum is 54.

The square root of 645649695 is about 25409.6378368524. The cubic root of 645649695 is about 864.3022629100.

The spelling of 645649695 in words is "six hundred forty-five million, six hundred forty-nine thousand, six hundred ninety-five".