645526503 has 10 divisors (see below), whose sum is σ = 964305144. Its totient is φ = 430350948.

The previous prime is 645526489. The next prime is 645526507. The reversal of 645526503 is 305625546.

It is a happy number.

645526503 is a `hidden beast` number, since 645 + 5 + 2 + 6 + 5 + 0 + 3 = 666.

It is not a de Polignac number, because 645526503 - 2⁵ = 645526471 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645526507) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3984651 + ... + 3984812.

Almost surely, 2^645526503 is an apocalyptic number.

645526503 is a deficient number, since it is larger than the sum of its proper divisors (318778641).

645526503 is an equidigital number, since it uses as much as digits as its factorization.

645526503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7969475 (or 7969466 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

The square root of 645526503 is about 25407.2136016526. The cubic root of 645526503 is about 864.2472888801.

The spelling of 645526503 in words is "six hundred forty-five million, five hundred twenty-six thousand, five hundred three".