646599103 has 2 divisors, whose sum is σ = 646599104. Its totient is φ = 646599102.

The previous prime is 646599067. The next prime is 646599137. The reversal of 646599103 is 301995646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646599103 - 2⁹ = 646598591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646599103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646599193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323299551 + 323299552.

It is an arithmetic number, because the mean of its divisors is an integer number (323299552).

Almost surely, 2^646599103 is an apocalyptic number.

646599103 is a deficient number, since it is larger than the sum of its proper divisors (1).

646599103 is an equidigital number, since it uses as much as digits as its factorization.

646599103 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 646599103 is about 25428.3130191525. The cubic root of 646599103 is about 864.7256987180.

The spelling of 646599103 in words is "six hundred forty-six million, five hundred ninety-nine thousand, one hundred three".