68155691 has 2 divisors, whose sum is σ = 68155692. Its totient is φ = 68155690.

The previous prime is 68155673. The next prime is 68155697. The reversal of 68155691 is 19655186.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 68155691 - 2¹⁴ = 68139307 is a prime.

It is not a weakly prime, because it can be changed into another prime (68155697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34077845 + 34077846.

It is an arithmetic number, because the mean of its divisors is an integer number (34077846).

Almost surely, 2^68155691 is an apocalyptic number.

68155691 is a deficient number, since it is larger than the sum of its proper divisors (1).

68155691 is an equidigital number, since it uses as much as digits as its factorization.

68155691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 41.

The square root of 68155691 is about 8255.6460074303. The cubic root of 68155691 is about 408.4767810692.

The spelling of 68155691 in words is "sixty-eight million, one hundred fifty-five thousand, six hundred ninety-one".