16661123 has 2 divisors, whose sum is σ = 16661124. Its totient is φ = 16661122.

The previous prime is 16661107. The next prime is 16661143. The reversal of 16661123 is 32116661.

It is a weak prime.

It is an emirp because it is prime and its reverse (32116661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16661123 - 2⁴ = 16661107 is a prime.

It is a super-2 number, since 2×16661123² = 555186039242258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16661092 and 16661101.

It is not a weakly prime, because it can be changed into another prime (16661143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8330561 + 8330562.

It is an arithmetic number, because the mean of its divisors is an integer number (8330562).

Almost surely, 2^16661123 is an apocalyptic number.

16661123 is a deficient number, since it is larger than the sum of its proper divisors (1).

16661123 is an equidigital number, since it uses as much as digits as its factorization.

16661123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 16661123 is about 4081.8038904386. The cubic root of 16661123 is about 255.4081532302.

Adding to 16661123 its reverse (32116661), we get a palindrome (48777784).

The spelling of 16661123 in words is "sixteen million, six hundred sixty-one thousand, one hundred twenty-three".