61166517221612 has 24 divisors (see below), whose sum is σ = 121849504664832. Its totient is φ = 26594137922000.

The previous prime is 61166517221581. The next prime is 61166517221629. The reversal of 61166517221612 is 21612271566116.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30220610264 + ... + 30220612287.

It is an arithmetic number, because the mean of its divisors is an integer number (5077062694368).

Almost surely, 2^{61166517221612} is an apocalyptic number.

It is an amenable number.

61166517221612 is a deficient number, since it is larger than the sum of its proper divisors (60682987443220).

61166517221612 is a wasteful number, since it uses less digits than its factorization.

61166517221612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60441222589 (or 60441222587 counting only the distinct ones).

The product of its digits is 362880, while the sum is 47.

Adding to 61166517221612 its reverse (21612271566116), we get a palindrome (82778788787728).

The spelling of 61166517221612 in words is "sixty-one trillion, one hundred sixty-six billion, five hundred seventeen million, two hundred twenty-one thousand, six hundred twelve".