645739203 has 16 divisors (see below), whose sum is σ = 912314880. Its totient is φ = 404866176.

The previous prime is 645739189. The next prime is 645739219. The reversal of 645739203 is 302937546.

It is not a de Polignac number, because 645739203 - 2¹³ = 645731011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645739603) 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, 78018 + ... + 85896.

It is an arithmetic number, because the mean of its divisors is an integer number (57019680).

Almost surely, 2^645739203 is an apocalyptic number.

645739203 is a deficient number, since it is larger than the sum of its proper divisors (266575677).

645739203 is a wasteful number, since it uses less digits than its factorization.

645739203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9506.

The product of its (nonzero) digits is 136080, while the sum is 39.

The square root of 645739203 is about 25411.3990760052. The cubic root of 645739203 is about 864.3422011783.

The spelling of 645739203 in words is "six hundred forty-five million, seven hundred thirty-nine thousand, two hundred three".