16661542 has 4 divisors (see below), whose sum is σ = 24992316. Its totient is φ = 8330770.

The previous prime is 16661531. The next prime is 16661563. The reversal of 16661542 is 24516661.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 4165384 + ... + 4165387.

It is an arithmetic number, because the mean of its divisors is an integer number (6248079).

Almost surely, 2^16661542 is an apocalyptic number.

16661542 is a deficient number, since it is larger than the sum of its proper divisors (8330774).

16661542 is an equidigital number, since it uses as much as digits as its factorization.

16661542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8330773.

The product of its digits is 8640, while the sum is 31.

The square root of 16661542 is about 4081.8552154627. The cubic root of 16661542 is about 255.4102942447.

The spelling of 16661542 in words is "sixteen million, six hundred sixty-one thousand, five hundred forty-two".