61322121218 has 6 divisors (see below), whose sum is σ = 91983707139. Its totient is φ = 30660885506.

The previous prime is 61322121173. The next prime is 61322121227. The reversal of 61322121218 is 81212122316.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 30661060609 + 30661060609 = 175103^2 + 175103^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=175103.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 262655 + ... + 437757.

Almost surely, 2^61322121218 is an apocalyptic number.

61322121218 is a deficient number, since it is larger than the sum of its proper divisors (30661585921).

61322121218 is an frugal number, since it uses more digits than its factorization.

61322121218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350208 (or 175105 counting only the distinct ones).

The product of its digits is 2304, while the sum is 29.

The spelling of 61322121218 in words is "sixty-one billion, three hundred twenty-two million, one hundred twenty-one thousand, two hundred eighteen".