16663351 has 2 divisors, whose sum is σ = 16663352. Its totient is φ = 16663350.

The previous prime is 16663321. The next prime is 16663393. The reversal of 16663351 is 15336661.

16663351 = 1664² + 1665² + ... + 1669².

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16663351 - 2¹³ = 16655159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16663301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8331675 + 8331676.

It is an arithmetic number, because the mean of its divisors is an integer number (8331676).

Almost surely, 2^16663351 is an apocalyptic number.

16663351 is a deficient number, since it is larger than the sum of its proper divisors (1).

16663351 is an equidigital number, since it uses as much as digits as its factorization.

16663351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 31.

The square root of 16663351 is about 4082.0767998655. The cubic root of 16663351 is about 255.4195374968.

The spelling of 16663351 in words is "sixteen million, six hundred sixty-three thousand, three hundred fifty-one".