12121666015 has 16 divisors (see below), whose sum is σ = 14944612032. Its totient is φ = 9431783424.

The previous prime is 12121665991. The next prime is 12121666019. The reversal of 12121666015 is 51066612121.

It is a cyclic number.

It is not a de Polignac number, because 12121666015 - 2²⁷ = 11987448287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12121666019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 569902 + ... + 590788.

It is an arithmetic number, because the mean of its divisors is an integer number (934038252).

Almost surely, 2^12121666015 is an apocalyptic number.

12121666015 is a deficient number, since it is larger than the sum of its proper divisors (2822946017).

12121666015 is a wasteful number, since it uses less digits than its factorization.

12121666015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24066.

The product of its (nonzero) digits is 4320, while the sum is 31.

The spelling of 12121666015 in words is "twelve billion, one hundred twenty-one million, six hundred sixty-six thousand, fifteen".