12111972849 has 10 divisors (see below), whose sum is σ = 18093194130. Its totient is φ = 8074648512.

The previous prime is 12111972839. The next prime is 12111972863. The reversal of 12111972849 is 94827911121.

It can be written as a sum of positive squares in only one way, i.e., 9729849600 + 2382123249 = 98640^2 + 48807^2 .

It is not a de Polignac number, because 12111972849 - 2⁷ = 12111972721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12111972809) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 74765184 + ... + 74765345.

It is an arithmetic number, because the mean of its divisors is an integer number (1809319413).

Almost surely, 2^12111972849 is an apocalyptic number.

It is an amenable number.

12111972849 is a deficient number, since it is larger than the sum of its proper divisors (5981221281).

12111972849 is an equidigital number, since it uses as much as digits as its factorization.

12111972849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149530541 (or 149530532 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The spelling of 12111972849 in words is "twelve billion, one hundred eleven million, nine hundred seventy-two thousand, eight hundred forty-nine".