68661787 has 2 divisors, whose sum is σ = 68661788. Its totient is φ = 68661786.

The previous prime is 68661737. The next prime is 68661811. The reversal of 68661787 is 78716686.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68661787 - 2¹¹ = 68659739 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68661787.

It is not a weakly prime, because it can be changed into another prime (68661727) 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 as a sum of consecutive naturals, namely, 34330893 + 34330894.

It is an arithmetic number, because the mean of its divisors is an integer number (34330894).

Almost surely, 2^68661787 is an apocalyptic number.

68661787 is a deficient number, since it is larger than the sum of its proper divisors (1).

68661787 is an equidigital number, since it uses as much as digits as its factorization.

68661787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 49.

The square root of 68661787 is about 8286.2408244028. The cubic root of 68661787 is about 409.4853487035.

The spelling of 68661787 in words is "sixty-eight million, six hundred sixty-one thousand, seven hundred eighty-seven".