16662423 has 4 divisors (see below), whose sum is σ = 22216568. Its totient is φ = 11108280.

The previous prime is 16662409. The next prime is 16662427. The reversal of 16662423 is 32426661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32426661 = 3 ⋅10808887.

It is not a de Polignac number, because 16662423 - 2¹⁷ = 16531351 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 (16662427) 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, 2777068 + ... + 2777073.

It is an arithmetic number, because the mean of its divisors is an integer number (5554142).

Almost surely, 2^16662423 is an apocalyptic number.

16662423 is a deficient number, since it is larger than the sum of its proper divisors (5554145).

16662423 is an equidigital number, since it uses as much as digits as its factorization.

16662423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5554144.

The product of its digits is 10368, while the sum is 30.

The square root of 16662423 is about 4081.9631306517. The cubic root of 16662423 is about 255.4147958789.

The spelling of 16662423 in words is "sixteen million, six hundred sixty-two thousand, four hundred twenty-three".