16661073 has 32 divisors (see below), whose sum is σ = 26514432. Its totient is φ = 9172800.

The previous prime is 16660979. The next prime is 16661083. The reversal of 16661073 is 37016661.

It is not a de Polignac number, because 16661073 - 2¹⁴ = 16644689 is a prime.

It is a super-2 number, since 2×16661073² = 555182707022658, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16661073.

It is not an unprimeable number, because it can be changed into a prime (16661083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30186 + ... + 30732.

It is an arithmetic number, because the mean of its divisors is an integer number (828576).

Almost surely, 2^16661073 is an apocalyptic number.

16661073 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

16661073 is a deficient number, since it is larger than the sum of its proper divisors (9853359).

16661073 is a wasteful number, since it uses less digits than its factorization.

16661073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645.

The product of its (nonzero) digits is 4536, while the sum is 30.

The square root of 16661073 is about 4081.7977656910. The cubic root of 16661073 is about 255.4078977368.

The spelling of 16661073 in words is "sixteen million, six hundred sixty-one thousand, seventy-three".