11551975969 has 4 divisors (see below), whose sum is σ = 11595900096. Its totient is φ = 11508051844.

The previous prime is 11551975957. The next prime is 11551975991. The reversal of 11551975969 is 96957915511.

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: 96957915511 = 37 ⋅2620484203.

It is a cyclic number.

It is not a de Polignac number, because 11551975969 - 2⁵ = 11551975937 is a prime.

It is a super-2 number, since 2×11551975969² (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 (11551975909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21961669 + ... + 21962194.

It is an arithmetic number, because the mean of its divisors is an integer number (2898975024).

Almost surely, 2^11551975969 is an apocalyptic number.

It is an amenable number.

11551975969 is a deficient number, since it is larger than the sum of its proper divisors (43924127).

11551975969 is an equidigital number, since it uses as much as digits as its factorization.

11551975969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43924126.

The product of its digits is 3827250, while the sum is 58.

The spelling of 11551975969 in words is "eleven billion, five hundred fifty-one million, nine hundred seventy-five thousand, nine hundred sixty-nine".