645105225655 has 16 divisors (see below), whose sum is σ = 894177939744. Its totient is φ = 441569351680.

The previous prime is 645105225643. The next prime is 645105225679. The reversal of 645105225655 is 556522501546.

It is not a de Polignac number, because 645105225655 - 2⁹ = 645105225143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 344975122 + ... + 344976991.

It is an arithmetic number, because the mean of its divisors is an integer number (55886121234).

Almost surely, 2^645105225655 is an apocalyptic number.

645105225655 is a deficient number, since it is larger than the sum of its proper divisors (249072714089).

645105225655 is a wasteful number, since it uses less digits than its factorization.

645105225655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689952146.

The product of its (nonzero) digits is 1800000, while the sum is 46.

The spelling of 645105225655 in words is "six hundred forty-five billion, one hundred five million, two hundred twenty-five thousand, six hundred fifty-five".