11966389681 has 8 divisors (see below), whose sum is σ = 12037222080. Its totient is φ = 11895601872.

The previous prime is 11966389679. The next prime is 11966389717. The reversal of 11966389681 is 18698366911.

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 11966389681 - 2¹ = 11966389679 is a prime.

It is a super-2 number, since 2×11966389681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11966389651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 637476 + ... + 655978.

It is an arithmetic number, because the mean of its divisors is an integer number (1504652760).

Almost surely, 2^11966389681 is an apocalyptic number.

It is an amenable number.

11966389681 is a deficient number, since it is larger than the sum of its proper divisors (70832399).

11966389681 is a wasteful number, since it uses less digits than its factorization.

11966389681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22295.

The product of its digits is 3359232, while the sum is 58.

The spelling of 11966389681 in words is "eleven billion, nine hundred sixty-six million, three hundred eighty-nine thousand, six hundred eighty-one".