68666765 has 12 divisors (see below), whose sum is σ = 84204156. Its totient is φ = 53755968.

The previous prime is 68666749. The next prime is 68666777. The reversal of 68666765 is 56766686.

It can be written as a sum of positive squares in 2 ways, for example, as 37908649 + 30758116 = 6157^2 + 5546^2 .

It is not a de Polignac number, because 68666765 - 2⁴ = 68666749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 7937 + ... + 14153.

It is an arithmetic number, because the mean of its divisors is an integer number (7017013).

Almost surely, 2^68666765 is an apocalyptic number.

It is an amenable number.

68666765 is a deficient number, since it is larger than the sum of its proper divisors (15537391).

68666765 is an equidigital number, since it uses as much as digits as its factorization.

68666765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6316 (or 6269 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 50.

The square root of 68666765 is about 8286.5411964221. The cubic root of 68666765 is about 409.4952444009.

It can be divided in two parts, 6866 and 6765, that added together give a palindrome (13631).

The spelling of 68666765 in words is "sixty-eight million, six hundred sixty-six thousand, seven hundred sixty-five".