16417661 has 4 divisors (see below), whose sum is σ = 17680572. Its totient is φ = 15154752.

The previous prime is 16417637. The next prime is 16417663. The reversal of 16417661 is 16671461.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1012036 + 15405625 = 1006^2 + 3925^2 .

It is a cyclic number.

It is not a de Polignac number, because 16417661 - 2¹⁰ = 16416637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16417663) 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, 631436 + ... + 631461.

It is an arithmetic number, because the mean of its divisors is an integer number (4420143).

Almost surely, 2^16417661 is an apocalyptic number.

It is an amenable number.

16417661 is a deficient number, since it is larger than the sum of its proper divisors (1262911).

16417661 is a wasteful number, since it uses less digits than its factorization.

16417661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262910.

The product of its digits is 6048, while the sum is 32.

The square root of 16417661 is about 4051.8712960804. The cubic root of 16417661 is about 254.1579865291.

The spelling of 16417661 in words is "sixteen million, four hundred seventeen thousand, six hundred sixty-one".