68549188761 has 21 divisors (see below), whose sum is σ = 102787367151. Its totient is φ = 45694746432.

The previous prime is 68549188711. The next prime is 68549188787. The reversal of 68549188761 is 16788194586.

The square root of 68549188761 is 261819.

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

68549188761 is a `hidden beast` number, since 6 + 8 + 5 + 491 + 8 + 87 + 61 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8551625625 + 59997563136 = 92475^2 + 244944^2 .

It is not a de Polignac number, because 68549188761 - 2⁷ = 68549188633 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68549188711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 7064265 + ... + 7073961.

It is an arithmetic number, because the mean of its divisors is an integer number (4894636531).

Almost surely, 2^68549188761 is an apocalyptic number.

68549188761 is the 261819-th square number.

68549188761 is the 130910-th centered octagonal number.

It is an amenable number.

68549188761 is a deficient number, since it is larger than the sum of its proper divisors (34238178390).

68549188761 is an frugal number, since it uses more digits than its factorization.

68549188761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19412 (or 9700 counting only the distinct ones).

The product of its digits is 23224320, while the sum is 63.

The spelling of 68549188761 in words is "sixty-eight billion, five hundred forty-nine million, one hundred eighty-eight thousand, seven hundred sixty-one".