645622455 has 16 divisors (see below), whose sum is σ = 1034449920. Its totient is φ = 343847328.

The previous prime is 645622433. The next prime is 645622477. The reversal of 645622455 is 554226546.

645622455 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (645622433) and next prime (645622477).

It is not a de Polignac number, because 645622455 - 2⁵ = 645622423 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 19147 + ... + 40716.

It is an arithmetic number, because the mean of its divisors is an integer number (64653120).

Almost surely, 2^645622455 is an apocalyptic number.

645622455 is a deficient number, since it is larger than the sum of its proper divisors (388827465).

645622455 is a wasteful number, since it uses less digits than its factorization.

645622455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60590.

The product of its digits is 288000, while the sum is 39.

The square root of 645622455 is about 25409.1018141138. The cubic root of 645622455 is about 864.2901077507.

The spelling of 645622455 in words is "six hundred forty-five million, six hundred twenty-two thousand, four hundred fifty-five".