416661409 has 4 divisors (see below), whose sum is σ = 422880304. Its totient is φ = 410442516.

The previous prime is 416661407. The next prime is 416661419. The reversal of 416661409 is 904166614.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 416661409 - 2¹ = 416661407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (416661407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3109347 + ... + 3109480.

It is an arithmetic number, because the mean of its divisors is an integer number (105720076).

Almost surely, 2^416661409 is an apocalyptic number.

It is an amenable number.

416661409 is a deficient number, since it is larger than the sum of its proper divisors (6218895).

416661409 is an equidigital number, since it uses as much as digits as its factorization.

416661409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6218894.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 416661409 is about 20412.2857367812. The cubic root of 416661409 is about 746.8976495153.

It can be divided in two parts, 416 and 661409, that added together give a triangular number (661825 = T₁₁₅₀).

The spelling of 416661409 in words is "four hundred sixteen million, six hundred sixty-one thousand, four hundred nine".