12136017861 has 20 divisors (see below), whose sum is σ = 19777215744. Its totient is φ = 7355161800.

The previous prime is 12136017847. The next prime is 12136017869. The reversal of 12136017861 is 16871063121.

12136017861 is a `hidden beast` number, since 121 + 360 + 178 + 6 + 1 = 666.

It is not a de Polignac number, because 12136017861 - 2¹⁴ = 12136001477 is a prime.

It is a super-2 number, since 2×12136017861² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12136017869) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6809445 + ... + 6811226.

Almost surely, 2^12136017861 is an apocalyptic number.

12136017861 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12136017861 is a deficient number, since it is larger than the sum of its proper divisors (7641197883).

12136017861 is a wasteful number, since it uses less digits than its factorization.

12136017861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13620694 (or 13620685 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The spelling of 12136017861 in words is "twelve billion, one hundred thirty-six million, seventeen thousand, eight hundred sixty-one".