16663261 has 8 divisors (see below), whose sum is σ = 17123904. Its totient is φ = 16205280.

The previous prime is 16663259. The next prime is 16663271. The reversal of 16663261 is 16236661.

16663261 = T₈₈₁ + T₈₈₂ + ... + T₉₂₁.

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

It is a cyclic number.

It is not a de Polignac number, because 16663261 - 2¹ = 16663259 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 (16663271) 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, 22056 + ... + 22798.

It is an arithmetic number, because the mean of its divisors is an integer number (2140488).

Almost surely, 2^16663261 is an apocalyptic number.

It is an amenable number.

16663261 is a deficient number, since it is larger than the sum of its proper divisors (460643).

16663261 is an equidigital number, since it uses as much as digits as its factorization.

16663261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331.

The product of its digits is 7776, while the sum is 31.

The square root of 16663261 is about 4082.0657760502. The cubic root of 16663261 is about 255.4190776494.

The spelling of 16663261 in words is "sixteen million, six hundred sixty-three thousand, two hundred sixty-one".