16630181 has 4 divisors (see below), whose sum is σ = 16944012. Its totient is φ = 16316352.

The previous prime is 16630177. The next prime is 16630193. The reversal of 16630181 is 18103661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18103661 = 491 ⋅36871.

It can be written as a sum of positive squares in 2 ways, for example, as 14753281 + 1876900 = 3841^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 16630181 - 2² = 16630177 is a prime.

It is a super-2 number, since 2×16630181² = 553125840185522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16630181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16630171) 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, 156836 + ... + 156941.

It is an arithmetic number, because the mean of its divisors is an integer number (4236003).

Almost surely, 2^16630181 is an apocalyptic number.

It is an amenable number.

16630181 is a deficient number, since it is larger than the sum of its proper divisors (313831).

16630181 is an equidigital number, since it uses as much as digits as its factorization.

16630181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313830.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 16630181 is about 4078.0118930675. The cubic root of 16630181 is about 255.2499458802.

The spelling of 16630181 in words is "sixteen million, six hundred thirty thousand, one hundred eighty-one".