11965208929 has 4 divisors (see below), whose sum is σ = 11966476480. Its totient is φ = 11963941380.

The previous prime is 11965208917. The next prime is 11965208989. The reversal of 11965208929 is 92980256911.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92980256911 = 28289 ⋅3286799.

It is a cyclic number.

It is not a de Polignac number, because 11965208929 - 2⁹ = 11965208417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11965208989) 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, 619509 + ... + 638530.

It is an arithmetic number, because the mean of its divisors is an integer number (2991619120).

Almost surely, 2^11965208929 is an apocalyptic number.

It is an amenable number.

11965208929 is a deficient number, since it is larger than the sum of its proper divisors (1267551).

11965208929 is an equidigital number, since it uses as much as digits as its factorization.

11965208929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267550.

The product of its (nonzero) digits is 699840, while the sum is 52.

It can be divided in two parts, 1196 and 5208929, that added together give a palindrome (5210125).

The spelling of 11965208929 in words is "eleven billion, nine hundred sixty-five million, two hundred eight thousand, nine hundred twenty-nine".