68215000247 has 2 divisors, whose sum is σ = 68215000248. Its totient is φ = 68215000246.

The previous prime is 68215000219. The next prime is 68215000267. The reversal of 68215000247 is 74200051286.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68215000247 is a prime.

It is a super-2 number, since 2×68215000247² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68215000267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34107500123 + 34107500124.

It is an arithmetic number, because the mean of its divisors is an integer number (34107500124).

Almost surely, 2^68215000247 is an apocalyptic number.

68215000247 is a deficient number, since it is larger than the sum of its proper divisors (1).

68215000247 is an equidigital number, since it uses as much as digits as its factorization.

68215000247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 35.

The spelling of 68215000247 in words is "sixty-eight billion, two hundred fifteen million, two hundred forty-seven", and thus it is an aban number.