12161660105 has 64 divisors (see below), whose sum is σ = 17607974400. Its totient is φ = 8055919872.

The previous prime is 12161660101. The next prime is 12161660153. The reversal of 12161660105 is 50106616121.

It is not a de Polignac number, because 12161660105 - 2² = 12161660101 is a prime.

It is a super-2 number, since 2×12161660105² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12161660101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6088967 + ... + 6090963.

It is an arithmetic number, because the mean of its divisors is an integer number (275124600).

Almost surely, 2^12161660105 is an apocalyptic number.

It is an amenable number.

12161660105 is a deficient number, since it is larger than the sum of its proper divisors (5446314295).

12161660105 is an equidigital number, since it uses as much as digits as its factorization.

12161660105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143 (or 2129 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 29.

The spelling of 12161660105 in words is "twelve billion, one hundred sixty-one million, six hundred sixty thousand, one hundred five".