646403603 has 2 divisors, whose sum is σ = 646403604. Its totient is φ = 646403602.

The previous prime is 646403561. The next prime is 646403623. The reversal of 646403603 is 306304646.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646403603 is a prime.

It is equal to p_33616085 and since 646403603 and 33616085 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646403603.

It is not a weakly prime, because it can be changed into another prime (646403623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323201801 + 323201802.

It is an arithmetic number, because the mean of its divisors is an integer number (323201802).

Almost surely, 2^646403603 is an apocalyptic number.

646403603 is a deficient number, since it is larger than the sum of its proper divisors (1).

646403603 is an equidigital number, since it uses as much as digits as its factorization.

646403603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31104, while the sum is 32.

The square root of 646403603 is about 25424.4685883501. The cubic root of 646403603 is about 864.6385396555.

The spelling of 646403603 in words is "six hundred forty-six million, four hundred three thousand, six hundred three".