12150666561 has 32 divisors (see below), whose sum is σ = 18151168896. Its totient is φ = 7166016000.

The previous prime is 12150666557. The next prime is 12150666569. The reversal of 12150666561 is 16566605121.

It is not a de Polignac number, because 12150666561 - 2² = 12150666557 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12150666569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 525831 + ... + 548451.

It is an arithmetic number, because the mean of its divisors is an integer number (567224028).

Almost surely, 2^12150666561 is an apocalyptic number.

12150666561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12150666561 is a deficient number, since it is larger than the sum of its proper divisors (6000502335).

12150666561 is a wasteful number, since it uses less digits than its factorization.

12150666561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23073.

The product of its (nonzero) digits is 64800, while the sum is 39.

The spelling of 12150666561 in words is "twelve billion, one hundred fifty million, six hundred sixty-six thousand, five hundred sixty-one".