11721461666 has 8 divisors (see below), whose sum is σ = 17673292524. Its totient is φ = 5830364160.

The previous prime is 11721461659. The next prime is 11721461671. The reversal of 11721461666 is 66616412711.

It can be written as a sum of positive squares in 2 ways, for example, as 10390744225 + 1330717441 = 101935^2 + 36479^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15182855 + ... + 15183626.

Almost surely, 2^11721461666 is an apocalyptic number.

11721461666 is a deficient number, since it is larger than the sum of its proper divisors (5951830858).

11721461666 is a wasteful number, since it uses less digits than its factorization.

11721461666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30366676.

The product of its digits is 72576, while the sum is 41.

The spelling of 11721461666 in words is "eleven billion, seven hundred twenty-one million, four hundred sixty-one thousand, six hundred sixty-six".