645237105 has 16 divisors (see below), whose sum is σ = 1051859520. Its totient is φ = 337633088.

The previous prime is 645237083. The next prime is 645237107. The reversal of 645237105 is 501732546.

645237105 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 645237105 - 2⁸ = 645236849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645237107) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405015 + ... + 406604.

It is an arithmetic number, because the mean of its divisors is an integer number (65741220).

Almost surely, 2^645237105 is an apocalyptic number.

It is an amenable number.

645237105 is a deficient number, since it is larger than the sum of its proper divisors (406622415).

645237105 is a wasteful number, since it uses less digits than its factorization.

645237105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 811680.

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 645237105 is about 25401.5177696137. The cubic root of 645237105 is about 864.1181184426.

The spelling of 645237105 in words is "six hundred forty-five million, two hundred thirty-seven thousand, one hundred five".