16665354417 has 4 divisors (see below), whose sum is σ = 22220472560. Its totient is φ = 11110236276.

The previous prime is 16665354403. The next prime is 16665354427. The reversal of 16665354417 is 71445356661.

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 not a de Polignac number, because 16665354417 - 2⁷ = 16665354289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16665354427) 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, 2777559067 + ... + 2777559072.

It is an arithmetic number, because the mean of its divisors is an integer number (5555118140).

Almost surely, 2^16665354417 is an apocalyptic number.

It is an amenable number.

16665354417 is a deficient number, since it is larger than the sum of its proper divisors (5555118143).

16665354417 is an equidigital number, since it uses as much as digits as its factorization.

16665354417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5555118142.

The product of its digits is 1814400, while the sum is 48.

The spelling of 16665354417 in words is "sixteen billion, six hundred sixty-five million, three hundred fifty-four thousand, four hundred seventeen".