16440663 has 8 divisors (see below), whose sum is σ = 22430848. Its totient is φ = 10705464.

The previous prime is 16440629. The next prime is 16440673. The reversal of 16440663 is 36604461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16440663 - 2⁸ = 16440407 is a prime.

It is a super-3 number, since 3×16440663³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16440663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63595 + ... + 63852.

It is an arithmetic number, because the mean of its divisors is an integer number (2803856).

Almost surely, 2^16440663 is an apocalyptic number.

16440663 is a deficient number, since it is larger than the sum of its proper divisors (5990185).

16440663 is a wasteful number, since it uses less digits than its factorization.

16440663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127493.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 16440663 is about 4054.7087441640. The cubic root of 16440663 is about 254.2766273407.

The spelling of 16440663 in words is "sixteen million, four hundred forty thousand, six hundred sixty-three".