11990591779 has 4 divisors (see below), whose sum is σ = 11990880720. Its totient is φ = 11990302840.

The previous prime is 11990591777. The next prime is 11990591803. The reversal of 11990591779 is 97719509911.

11990591779 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97719509911 = 1009 ⋅96847879.

It is a cyclic number.

It is not a de Polignac number, because 11990591779 - 2¹ = 11990591777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11990591777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69124 + ... + 169585.

It is an arithmetic number, because the mean of its divisors is an integer number (2997720180).

Almost surely, 2^11990591779 is an apocalyptic number.

11990591779 is a deficient number, since it is larger than the sum of its proper divisors (288941).

11990591779 is an equidigital number, since it uses as much as digits as its factorization.

11990591779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 288940.

The product of its (nonzero) digits is 1607445, while the sum is 58.

The spelling of 11990591779 in words is "eleven billion, nine hundred ninety million, five hundred ninety-one thousand, seven hundred seventy-nine".