16662403 has 2 divisors, whose sum is σ = 16662404. Its totient is φ = 16662402.

The previous prime is 16662343. The next prime is 16662409. The reversal of 16662403 is 30426661.

It is a strong prime.

It is an emirp because it is prime and its reverse (30426661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16662403 - 2¹⁷ = 16531331 is a prime.

It is a zygodrome in base 2.

It is not a weakly prime, because it can be changed into another prime (16662409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331201 + 8331202.

It is an arithmetic number, because the mean of its divisors is an integer number (8331202).

Almost surely, 2^16662403 is an apocalyptic number.

16662403 is a deficient number, since it is larger than the sum of its proper divisors (1).

16662403 is an equidigital number, since it uses as much as digits as its factorization.

16662403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 16662403 is about 4081.9606808493. The cubic root of 16662403 is about 255.4146936869.

The spelling of 16662403 in words is "sixteen million, six hundred sixty-two thousand, four hundred three".