16166642 has 4 divisors (see below), whose sum is σ = 24249966. Its totient is φ = 8083320.

The previous prime is 16166641. The next prime is 16166681. The reversal of 16166642 is 24666161.

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

It can be written as a sum of positive squares in only one way, i.e., 10686361 + 5480281 = 3269^2 + 2341^2 .

It is a super-2 number, since 2×16166642² = 522720627112328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16166599 and 16166608.

It is not an unprimeable number, because it can be changed into a prime (16166641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4041659 + ... + 4041662.

Almost surely, 2^16166642 is an apocalyptic number.

16166642 is a deficient number, since it is larger than the sum of its proper divisors (8083324).

16166642 is an equidigital number, since it uses as much as digits as its factorization.

16166642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8083323.

The product of its digits is 10368, while the sum is 32.

The square root of 16166642 is about 4020.7762932051. The cubic root of 16166642 is about 252.8560060079.

The spelling of 16166642 in words is "sixteen million, one hundred sixty-six thousand, six hundred forty-two".