16623261 has 12 divisors (see below), whose sum is σ = 24092640. Its totient is φ = 11044680.

The previous prime is 16623247. The next prime is 16623281. The reversal of 16623261 is 16232661.

16623261 is a `hidden beast` number, since 16 + 623 + 26 + 1 = 666.

It is not a de Polignac number, because 16623261 - 2⁶ = 16623197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16623281) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171 + ... + 5768.

It is an arithmetic number, because the mean of its divisors is an integer number (2007720).

Almost surely, 2^16623261 is an apocalyptic number.

It is an amenable number.

16623261 is a deficient number, since it is larger than the sum of its proper divisors (7469379).

16623261 is a wasteful number, since it uses less digits than its factorization.

16623261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6256 (or 6253 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 16623261 is about 4077.1633521359. The cubic root of 16623261 is about 255.2145368714.

The spelling of 16623261 in words is "sixteen million, six hundred twenty-three thousand, two hundred sixty-one".