16663742 has 4 divisors (see below), whose sum is σ = 24995616. Its totient is φ = 8331870.

The previous prime is 16663697. The next prime is 16663763. The reversal of 16663742 is 24736661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24736661 = 23 ⋅1075507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4165934 + ... + 4165937.

It is an arithmetic number, because the mean of its divisors is an integer number (6248904).

Almost surely, 2^16663742 is an apocalyptic number.

16663742 is a deficient number, since it is larger than the sum of its proper divisors (8331874).

16663742 is an equidigital number, since it uses as much as digits as its factorization.

16663742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8331873.

The product of its digits is 36288, while the sum is 35.

The square root of 16663742 is about 4082.1246918731. The cubic root of 16663742 is about 255.4215352594.

The spelling of 16663742 in words is "sixteen million, six hundred sixty-three thousand, seven hundred forty-two".