645604283 has 2 divisors, whose sum is σ = 645604284. Its totient is φ = 645604282.

The previous prime is 645604261. The next prime is 645604307. The reversal of 645604283 is 382406546.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645604283 - 2¹² = 645600187 is a prime.

It is not a weakly prime, because it can be changed into another prime (645604483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322802141 + 322802142.

It is an arithmetic number, because the mean of its divisors is an integer number (322802142).

Almost surely, 2^645604283 is an apocalyptic number.

645604283 is a deficient number, since it is larger than the sum of its proper divisors (1).

645604283 is an equidigital number, since it uses as much as digits as its factorization.

645604283 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 38.

The square root of 645604283 is about 25408.7442232000. The cubic root of 645604283 is about 864.2819987663.

The spelling of 645604283 in words is "six hundred forty-five million, six hundred four thousand, two hundred eighty-three".