12111253661 has 8 divisors (see below), whose sum is σ = 13169520000. Its totient is φ = 11071077552.

The previous prime is 12111253643. The next prime is 12111253669. The reversal of 12111253661 is 16635211121.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12111253661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111253669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4521161 + ... + 4523838.

It is an arithmetic number, because the mean of its divisors is an integer number (1646190000).

Almost surely, 2^12111253661 is an apocalyptic number.

It is an amenable number.

12111253661 is a deficient number, since it is larger than the sum of its proper divisors (1058266339).

12111253661 is a wasteful number, since it uses less digits than its factorization.

12111253661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9045115.

The product of its digits is 2160, while the sum is 29.

Adding to 12111253661 its reverse (16635211121), we get a palindrome (28746464782).

The spelling of 12111253661 in words is "twelve billion, one hundred eleven million, two hundred fifty-three thousand, six hundred sixty-one".