68861869 has 2 divisors, whose sum is σ = 68861870. Its totient is φ = 68861868.

The previous prime is 68861867. The next prime is 68861873. The reversal of 68861869 is 96816886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53846244 + 15015625 = 7338^2 + 3875^2 .

It is a cyclic number.

It is not a de Polignac number, because 68861869 - 2¹ = 68861867 is a prime.

It is a super-2 number, since 2×68861869² = 9483914004346322, which contains 22 as substring.

Together with 68861867, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68861867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34430934 + 34430935.

It is an arithmetic number, because the mean of its divisors is an integer number (34430935).

Almost surely, 2^68861869 is an apocalyptic number.

It is an amenable number.

68861869 is a deficient number, since it is larger than the sum of its proper divisors (1).

68861869 is an equidigital number, since it uses as much as digits as its factorization.

68861869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 52.

The square root of 68861869 is about 8298.3051884105. The cubic root of 68861869 is about 409.8827128324.

The spelling of 68861869 in words is "sixty-eight million, eight hundred sixty-one thousand, eight hundred sixty-nine".