646043603 has 2 divisors, whose sum is σ = 646043604. Its totient is φ = 646043602.

The previous prime is 646043549. The next prime is 646043609. The reversal of 646043603 is 306340646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646043603 - 2¹² = 646039507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646043603.

It is not a weakly prime, because it can be changed into another prime (646043609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323021801 + 323021802.

It is an arithmetic number, because the mean of its divisors is an integer number (323021802).

Almost surely, 2^646043603 is an apocalyptic number.

646043603 is a deficient number, since it is larger than the sum of its proper divisors (1).

646043603 is an equidigital number, since it uses as much as digits as its factorization.

646043603 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 646043603 is about 25417.3878083488. The cubic root of 646043603 is about 864.4779961624.

It can be divided in two parts, 646043 and 603, that added together give a palindrome (646646).

The spelling of 646043603 in words is "six hundred forty-six million, forty-three thousand, six hundred three".