12012100805658 has 16 divisors (see below), whose sum is σ = 24025267587456. Its totient is φ = 4003855939200.

The previous prime is 12012100805647. The next prime is 12012100805711. The reversal of 12012100805658 is 85650800121021.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44269143 + ... + 44539658.

It is an arithmetic number, because the mean of its divisors is an integer number (1501579224216).

Almost surely, 2^{12012100805658} is an apocalyptic number.

12012100805658 is an abundant number, since it is smaller than the sum of its proper divisors (12013166781798).

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

12012100805658 is a wasteful number, since it uses less digits than its factorization.

12012100805658 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88831349.

The product of its (nonzero) digits is 38400, while the sum is 39.

Adding to 12012100805658 its reverse (85650800121021), we get a palindrome (97662900926679).

The spelling of 12012100805658 in words is "twelve trillion, twelve billion, one hundred million, eight hundred five thousand, six hundred fifty-eight".