6646403 has 2 divisors, whose sum is σ = 6646404. Its totient is φ = 6646402.

The previous prime is 6646399. The next prime is 6646417. The reversal of 6646403 is 3046466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6646403 - 2² = 6646399 is a prime.

It is an Ulam number.

It is not a weakly prime, because it can be changed into another prime (6642403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323201 + 3323202.

It is an arithmetic number, because the mean of its divisors is an integer number (3323202).

Almost surely, 2^6646403 is an apocalyptic number.

6646403 is a deficient number, since it is larger than the sum of its proper divisors (1).

6646403 is an equidigital number, since it uses as much as digits as its factorization.

6646403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 6646403 is about 2578.0618689240. The cubic root of 6646403 is about 188.0163238429.

The spelling of 6646403 in words is "six million, six hundred forty-six thousand, four hundred three".