16636481 has 8 divisors (see below), whose sum is σ = 16938600. Its totient is φ = 16336512.

The previous prime is 16636463. The next prime is 16636483. The reversal of 16636481 is 18463661.

It can be written as a sum of positive squares in 4 ways, for example, as 2611456 + 14025025 = 1616^2 + 3745^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16636481 - 2¹⁰ = 16635457 is a prime.

It is a super-2 number, since 2×16636481² = 553545000126722, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16636483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25151 + ... + 25803.

It is an arithmetic number, because the mean of its divisors is an integer number (2117325).

Almost surely, 2^16636481 is an apocalyptic number.

It is an amenable number.

16636481 is a deficient number, since it is larger than the sum of its proper divisors (302119).

16636481 is an equidigital number, since it uses as much as digits as its factorization.

With its predecessor (16636480) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1075).

16636481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075.

The product of its digits is 20736, while the sum is 35.

The square root of 16636481 is about 4078.7842551427. The cubic root of 16636481 is about 255.2821738646.

The spelling of 16636481 in words is "sixteen million, six hundred thirty-six thousand, four hundred eighty-one".