12011620665 has 32 divisors (see below), whose sum is σ = 20974928256. Its totient is φ = 5821263360.

The previous prime is 12011620627. The next prime is 12011620667. The reversal of 12011620665 is 56602611021.

It is not a de Polignac number, because 12011620665 - 2⁶ = 12011620601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12011620667) 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 31 ways as a sum of consecutive naturals, for example, 393327 + ... + 422763.

It is an arithmetic number, because the mean of its divisors is an integer number (655466508).

Almost surely, 2^12011620665 is an apocalyptic number.

12011620665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12011620665 is a deficient number, since it is larger than the sum of its proper divisors (8963307591).

12011620665 is a wasteful number, since it uses less digits than its factorization.

12011620665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31929.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 12011620665 in words is "twelve billion, eleven million, six hundred twenty thousand, six hundred sixty-five".