645580803 has 32 divisors (see below), whose sum is σ = 1071244800. Its totient is φ = 337430016.

The previous prime is 645580781. The next prime is 645580843. The reversal of 645580803 is 308085546.

It is a happy number.

It is not a de Polignac number, because 645580803 - 2¹² = 645576707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645580843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16326 + ... + 39467.

It is an arithmetic number, because the mean of its divisors is an integer number (33476400).

Almost surely, 2^645580803 is an apocalyptic number.

645580803 is a deficient number, since it is larger than the sum of its proper divisors (425663997).

645580803 is a wasteful number, since it uses less digits than its factorization.

645580803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55851.

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 645580803 is about 25408.2821733387. The cubic root of 645580803 is about 864.2715209407.

The spelling of 645580803 in words is "six hundred forty-five million, five hundred eighty thousand, eight hundred three".