12001516605 has 64 divisors (see below), whose sum is σ = 24328926720. Its totient is φ = 5560869888.

The previous prime is 12001516567. The next prime is 12001516619. The reversal of 12001516605 is 50661510021.

It is a happy number.

12001516605 is a `hidden beast` number, since 1 + 2 + 0 + 0 + 1 + 51 + 6 + 605 = 666.

It is not a de Polignac number, because 12001516605 - 2⁸ = 12001516349 is a prime.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 171297 + ... + 230966.

It is an arithmetic number, because the mean of its divisors is an integer number (380139480).

Almost surely, 2^12001516605 is an apocalyptic number.

12001516605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12001516605 is an abundant number, since it is smaller than the sum of its proper divisors (12327410115).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12001516605 is a wasteful number, since it uses less digits than its factorization.

12001516605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402307 (or 402301 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The spelling of 12001516605 in words is "twelve billion, one million, five hundred sixteen thousand, six hundred five".