645163055 has 4 divisors (see below), whose sum is σ = 774195672. Its totient is φ = 516130440.

The previous prime is 645163037. The next prime is 645163061. The reversal of 645163055 is 550361546.

645163055 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-645163055 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 3 ways as a sum of consecutive naturals, for example, 64516301 + ... + 64516310.

It is an arithmetic number, because the mean of its divisors is an integer number (193548918).

Almost surely, 2^645163055 is an apocalyptic number.

645163055 is a deficient number, since it is larger than the sum of its proper divisors (129032617).

645163055 is a wasteful number, since it uses less digits than its factorization.

645163055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129032616.

The product of its (nonzero) digits is 54000, while the sum is 35.

The square root of 645163055 is about 25400.0601377241. The cubic root of 645163055 is about 864.0850606234.

The spelling of 645163055 in words is "six hundred forty-five million, one hundred sixty-three thousand, fifty-five".