11111066721661 has 8 divisors (see below), whose sum is σ = 11167117371200. Its totient is φ = 11055018233952.

The previous prime is 11111066721659. The next prime is 11111066721697. The reversal of 11111066721661 is 16612766011111.

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 11111066721661 - 2¹ = 11111066721659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111066761661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10313041 + ... + 11339353.

It is an arithmetic number, because the mean of its divisors is an integer number (1395889671400).

Almost surely, 2^{11111066721661} is an apocalyptic number.

It is an amenable number.

11111066721661 is a deficient number, since it is larger than the sum of its proper divisors (56050649539).

11111066721661 is a wasteful number, since it uses less digits than its factorization.

11111066721661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080915.

The product of its (nonzero) digits is 18144, while the sum is 40.

The spelling of 11111066721661 in words is "eleven trillion, one hundred eleven billion, sixty-six million, seven hundred twenty-one thousand, six hundred sixty-one".