16406663 has 16 divisors (see below), whose sum is σ = 20892480. Its totient is φ = 12531456.

The previous prime is 16406653. The next prime is 16406701. The reversal of 16406663 is 36660461.

It is not a de Polignac number, because 16406663 - 2⁸ = 16406407 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16406653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 470 + ... + 5747.

It is an arithmetic number, because the mean of its divisors is an integer number (1305780).

Almost surely, 2^16406663 is an apocalyptic number.

16406663 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

16406663 is a deficient number, since it is larger than the sum of its proper divisors (4485817).

16406663 is a wasteful number, since it uses less digits than its factorization.

16406663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6266.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 16406663 is about 4050.5139180109. The cubic root of 16406663 is about 254.1012213595.

The spelling of 16406663 in words is "sixteen million, four hundred six thousand, six hundred sixty-three".