645554603 has 2 divisors, whose sum is σ = 645554604. Its totient is φ = 645554602.

The previous prime is 645554599. The next prime is 645554669. The reversal of 645554603 is 306455546.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 645554603 - 2² = 645554599 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (645514603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322777301 + 322777302.

It is an arithmetic number, because the mean of its divisors is an integer number (322777302).

Almost surely, 2^645554603 is an apocalyptic number.

645554603 is a deficient number, since it is larger than the sum of its proper divisors (1).

645554603 is an equidigital number, since it uses as much as digits as its factorization.

645554603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216000, while the sum is 38.

The square root of 645554603 is about 25407.7665881911. The cubic root of 645554603 is about 864.2598290295.

The spelling of 645554603 in words is "six hundred forty-five million, five hundred fifty-four thousand, six hundred three".