11660111599 has 4 divisors (see below), whose sum is σ = 11660548680. Its totient is φ = 11659674520.

The previous prime is 11660111591. The next prime is 11660111611. The reversal of 11660111599 is 99511106611.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99511106611 = 7 ⋅14215872373.

It is a cyclic number.

It is not a de Polignac number, because 11660111599 - 2³ = 11660111591 is a prime.

It is a super-2 number, since 2×11660111599² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11660111591) 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, 175729 + ... + 232810.

It is an arithmetic number, because the mean of its divisors is an integer number (2915137170).

Almost surely, 2^11660111599 is an apocalyptic number.

11660111599 is a deficient number, since it is larger than the sum of its proper divisors (437081).

11660111599 is an equidigital number, since it uses as much as digits as its factorization.

11660111599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437080.

The product of its (nonzero) digits is 14580, while the sum is 40.

The spelling of 11660111599 in words is "eleven billion, six hundred sixty million, one hundred eleven thousand, five hundred ninety-nine".