61778876882116 has 9 divisors (see below), whose sum is σ = 108113062053549. Its totient is φ = 30889430581104.

The previous prime is 61778876882113. The next prime is 61778876882147. The reversal of 61778876882116 is 61128867887716.

The square root of 61778876882116 is 7859954.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 4572284124100 + 57206592758016 = 2138290^2 + 7563504^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61778876882111) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 13754920 + ... + 17684896.

Almost surely, 2^{61778876882116} is an apocalyptic number.

61778876882116 is the 7859954-th square number.

It is an amenable number.

61778876882116 is a deficient number, since it is larger than the sum of its proper divisors (46334185171433).

61778876882116 is an frugal number, since it uses more digits than its factorization.

61778876882116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7859958 (or 3929979 counting only the distinct ones).

The product of its digits is 606928896, while the sum is 76.

The spelling of 61778876882116 in words is "sixty-one trillion, seven hundred seventy-eight billion, eight hundred seventy-six million, eight hundred eighty-two thousand, one hundred sixteen".