68885776521 has 27 divisors (see below), whose sum is σ = 100734712039. Its totient is φ = 45361659552.

The previous prime is 68885776507. The next prime is 68885776523. The reversal of 68885776521 is 12567758886.

The square root of 68885776521 is 262461.

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

68885776521 is a `hidden beast` number, since 6 + 8 + 8 + 8 + 577 + 6 + 52 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 13227530121 + 55658246400 = 115011^2 + 235920^2 .

It is not a de Polignac number, because 68885776521 - 2²⁷ = 68751558793 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68885776523) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 70076596 + ... + 70077578.

Almost surely, 2^68885776521 is an apocalyptic number.

68885776521 is the 262461-st square number.

68885776521 is the 131231-st centered octagonal number.

It is an amenable number.

68885776521 is a deficient number, since it is larger than the sum of its proper divisors (31848935518).

68885776521 is an frugal number, since it uses more digits than its factorization.

68885776521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150 (or 1075 counting only the distinct ones).

The product of its digits is 45158400, while the sum is 63.

The spelling of 68885776521 in words is "sixty-eight billion, eight hundred eighty-five million, seven hundred seventy-six thousand, five hundred twenty-one".