12161015505 has 24 divisors (see below), whose sum is σ = 21137837760. Its totient is φ = 6467799840.

The previous prime is 12161015479. The next prime is 12161015507. The reversal of 12161015505 is 50551016121.

12161015505 is a `hidden beast` number, since 1 + 2 + 1 + 6 + 101 + 550 + 5 = 666.

It is not a de Polignac number, because 12161015505 - 2⁸ = 12161015249 is a prime.

It is a super-2 number, since 2×12161015505² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12161015507) 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 23 ways as a sum of consecutive naturals, for example, 360231 + ... + 392540.

It is an arithmetic number, because the mean of its divisors is an integer number (880743240).

Almost surely, 2^12161015505 is an apocalyptic number.

12161015505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12161015505 is a deficient number, since it is larger than the sum of its proper divisors (8976822255).

12161015505 is a wasteful number, since it uses less digits than its factorization.

12161015505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753141 (or 753138 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 27.

The spelling of 12161015505 in words is "twelve billion, one hundred sixty-one million, fifteen thousand, five hundred five".