16662251 has 4 divisors (see below), whose sum is σ = 16703400. Its totient is φ = 16621104.

The previous prime is 16662241. The next prime is 16662263. The reversal of 16662251 is 15226661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16662251 - 2⁶ = 16662187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16662241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19961 + ... + 20778.

It is an arithmetic number, because the mean of its divisors is an integer number (4175850).

Almost surely, 2^16662251 is an apocalyptic number.

16662251 is the 1826-th centered decagonal number.

16662251 is a deficient number, since it is larger than the sum of its proper divisors (41149).

16662251 is an equidigital number, since it uses as much as digits as its factorization.

16662251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41148.

The product of its digits is 4320, while the sum is 29.

The square root of 16662251 is about 4081.9420623032. The cubic root of 16662251 is about 255.4139170252.

The spelling of 16662251 in words is "sixteen million, six hundred sixty-two thousand, two hundred fifty-one".