11996159521 has 4 divisors (see below), whose sum is σ = 11996569792. Its totient is φ = 11995749252.

The previous prime is 11996159507. The next prime is 11996159551. The reversal of 11996159521 is 12595169911.

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.

It is a cyclic number.

It is not a de Polignac number, because 11996159521 - 2⁹ = 11996159009 is a prime.

It is a super-3 number, since 3×11996159521³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11996159551) 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, 157605 + ... + 220978.

It is an arithmetic number, because the mean of its divisors is an integer number (2999142448).

Almost surely, 2^11996159521 is an apocalyptic number.

It is an amenable number.

11996159521 is a deficient number, since it is larger than the sum of its proper divisors (410271).

11996159521 is an equidigital number, since it uses as much as digits as its factorization.

11996159521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410270.

The product of its digits is 218700, while the sum is 49.

The spelling of 11996159521 in words is "eleven billion, nine hundred ninety-six million, one hundred fifty-nine thousand, five hundred twenty-one".