68506681 has 2 divisors, whose sum is σ = 68506682. Its totient is φ = 68506680.

The previous prime is 68506663. The next prime is 68506699. The reversal of 68506681 is 18660586.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (68506663) and next prime (68506699).

It can be written as a sum of positive squares in only one way, i.e., 59536656 + 8970025 = 7716^2 + 2995^2 .

It is a cyclic number.

It is not a de Polignac number, because 68506681 - 2⁵ = 68506649 is a prime.

It is a super-2 number, since 2×68506681² = 9386330683271522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68506661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34253340 + 34253341.

It is an arithmetic number, because the mean of its divisors is an integer number (34253341).

Almost surely, 2^68506681 is an apocalyptic number.

It is an amenable number.

68506681 is a deficient number, since it is larger than the sum of its proper divisors (1).

68506681 is an equidigital number, since it uses as much as digits as its factorization.

68506681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 68506681 is about 8276.8762827531. The cubic root of 68506681 is about 409.1767757071.

It can be divided in two parts, 6850 and 6681, that added together give a palindrome (13531).

The spelling of 68506681 in words is "sixty-eight million, five hundred six thousand, six hundred eighty-one".