68336756569 has 9 divisors (see below), whose sum is σ = 69305053629. Its totient is φ = 67381814880.

The previous prime is 68336756563. The next prime is 68336756647. The reversal of 68336756569 is 96565763386.

The square root of 68336756569 is 261413.

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

It can be written as a sum of positive squares in 4 ways, for example, as 16722369225 + 51614387344 = 129315^2 + 227188^2 .

It is not a de Polignac number, because 68336756569 - 2³ = 68336756561 is a prime.

It is a super-2 number, since 2×68336756569² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68336756569.

It is not an unprimeable number, because it can be changed into a prime (68336756561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19081359 + ... + 19084939.

Almost surely, 2^68336756569 is an apocalyptic number.

68336756569 is the 261413-rd square number.

68336756569 is the 130707-th centered octagonal number.

It is an amenable number.

68336756569 is a deficient number, since it is larger than the sum of its proper divisors (968297060).

68336756569 is an frugal number, since it uses more digits than its factorization.

68336756569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7308 (or 3654 counting only the distinct ones).

The product of its digits is 146966400, while the sum is 64.

Multiplying 68336756569 by its sum of digits (64), we get a square (4373552420416 = 2091304²).

It can be divided in two parts, 683367 and 56569, that added together give a triangular number (739936 = T₁₂₁₆).

The spelling of 68336756569 in words is "sixty-eight billion, three hundred thirty-six million, seven hundred fifty-six thousand, five hundred sixty-nine".