645353523 has 12 divisors (see below), whose sum is σ = 932778288. Its totient is φ = 429958320.

The previous prime is 645353521. The next prime is 645353531. The reversal of 645353523 is 325353546.

645353523 is a `hidden beast` number, since 645 + 3 + 5 + 3 + 5 + 2 + 3 = 666.

645353523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645353523 - 2¹ = 645353521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645353521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7848 + ... + 36773.

It is an arithmetic number, because the mean of its divisors is an integer number (77731524).

Almost surely, 2^645353523 is an apocalyptic number.

645353523 is a deficient number, since it is larger than the sum of its proper divisors (287424765).

645353523 is a wasteful number, since it uses less digits than its factorization.

645353523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46234 (or 46231 counting only the distinct ones).

The product of its digits is 162000, while the sum is 36.

The square root of 645353523 is about 25403.8092222407. The cubic root of 645353523 is about 864.1700853102.

The spelling of 645353523 in words is "six hundred forty-five million, three hundred fifty-three thousand, five hundred twenty-three".