12439212061866 has 32 divisors (see below), whose sum is σ = 24989545571328. Its totient is φ = 4127924983920.

The previous prime is 12439212061847. The next prime is 12439212061889. The reversal of 12439212061866 is 66816021293421.

It is a happy number.

It is a super-2 number, since 2×12439212061866² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3942460 + ... + 6357783.

It is an arithmetic number, because the mean of its divisors is an integer number (780923299104).

Almost surely, 2^{12439212061866} is an apocalyptic number.

12439212061866 is an abundant number, since it is smaller than the sum of its proper divisors (12550333509462).

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

12439212061866 is a wasteful number, since it uses less digits than its factorization.

12439212061866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10301146.

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 12439212061866 in words is "twelve trillion, four hundred thirty-nine billion, two hundred twelve million, sixty-one thousand, eight hundred sixty-six".