16557663 has 8 divisors (see below), whose sum is σ = 22192048. Its totient is φ = 10980864.

The previous prime is 16557661. The next prime is 16557707. The reversal of 16557663 is 36675561.

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

It is not a de Polignac number, because 16557663 - 2¹ = 16557661 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16557661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13720 + ... + 14877.

It is an arithmetic number, because the mean of its divisors is an integer number (2774006).

Almost surely, 2^16557663 is an apocalyptic number.

16557663 is a deficient number, since it is larger than the sum of its proper divisors (5634385).

16557663 is a wasteful number, since it uses less digits than its factorization.

16557663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28793.

The product of its digits is 113400, while the sum is 39.

The square root of 16557663 is about 4069.1108365342. The cubic root of 16557663 is about 254.8783887632.

The spelling of 16557663 in words is "sixteen million, five hundred fifty-seven thousand, six hundred sixty-three".