12005521515 has 80 divisors (see below), whose sum is σ = 23331502656. Its totient is φ = 5870880000.

The previous prime is 12005521459. The next prime is 12005521519. The reversal of 12005521515 is 51512550021.

12005521515 is a `hidden beast` number, since 120 + 0 + 5 + 5 + 21 + 515 = 666.

It is not a de Polignac number, because 12005521515 - 2⁸ = 12005521259 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12005521519) 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 79 ways as a sum of consecutive naturals, for example, 787465 + ... + 802565.

Almost surely, 2^12005521515 is an apocalyptic number.

12005521515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12005521515 is a deficient number, since it is larger than the sum of its proper divisors (11325981141).

12005521515 is a wasteful number, since it uses less digits than its factorization.

12005521515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15282 (or 15273 counting only the distinct ones).

The product of its (nonzero) digits is 2500, while the sum is 27.

The spelling of 12005521515 in words is "twelve billion, five million, five hundred twenty-one thousand, five hundred fifteen".