68206112569 has 9 divisors (see below), whose sum is σ = 79343931087. Its totient is φ = 58460815224.

The previous prime is 68206112567. The next prime is 68206112587. The reversal of 68206112569 is 96521160286.

The square root of 68206112569 is 261163.

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., 33274502569 + 34931610000 = 182413^2 + 186900^2 .

It is not a de Polignac number, because 68206112569 - 2¹ = 68206112567 is a prime.

It is a super-2 number, since 2×68206112569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68206112567) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1809487 + ... + 1846795.

It is an arithmetic number, because the mean of its divisors is an integer number (8815992343).

Almost surely, 2^68206112569 is an apocalyptic number.

68206112569 is the 261163-rd square number.

68206112569 is the 130582-nd centered octagonal number.

It is an amenable number.

68206112569 is a deficient number, since it is larger than the sum of its proper divisors (11137818518).

68206112569 is an frugal number, since it uses more digits than its factorization.

68206112569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74632 (or 37316 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 68206112569 in words is "sixty-eight billion, two hundred six million, one hundred twelve thousand, five hundred sixty-nine".