11943371561 has 8 divisors (see below), whose sum is σ = 13332136224. Its totient is φ = 10605107520.

The previous prime is 11943371543. The next prime is 11943371563. The reversal of 11943371561 is 16517334911.

11943371561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11943371561 - 2³⁰ = 10869629737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11943371563) 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 7 ways as a sum of consecutive naturals, for example, 12624656 + ... + 12625601.

It is an arithmetic number, because the mean of its divisors is an integer number (1666517028).

Almost surely, 2^11943371561 is an apocalyptic number.

11943371561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

11943371561 is a deficient number, since it is larger than the sum of its proper divisors (1388764663).

11943371561 is a wasteful number, since it uses less digits than its factorization.

11943371561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25250311.

The product of its digits is 68040, while the sum is 41.

The spelling of 11943371561 in words is "eleven billion, nine hundred forty-three million, three hundred seventy-one thousand, five hundred sixty-one".