11806989779 has 4 divisors (see below), whose sum is σ = 12715219776. Its totient is φ = 10898759784.

The previous prime is 11806989767. The next prime is 11806989797. The reversal of 11806989779 is 97798960811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97798960811 = 29 ⋅3372377959.

It is a cyclic number.

It is not a de Polignac number, because 11806989779 - 2¹⁶ = 11806924243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11806989479) 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, 454114979 + ... + 454115004.

It is an arithmetic number, because the mean of its divisors is an integer number (3178804944).

Almost surely, 2^11806989779 is an apocalyptic number.

11806989779 is a deficient number, since it is larger than the sum of its proper divisors (908229997).

11806989779 is an equidigital number, since it uses as much as digits as its factorization.

11806989779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908229996.

The product of its (nonzero) digits is 13716864, while the sum is 65.

The spelling of 11806989779 in words is "eleven billion, eight hundred six million, nine hundred eighty-nine thousand, seven hundred seventy-nine".