68721547087 has 2 divisors, whose sum is σ = 68721547088. Its totient is φ = 68721547086.

The previous prime is 68721547067. The next prime is 68721547129. The reversal of 68721547087 is 78074512786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 68721547087 - 2²⁷ = 68587329359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68721547067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34360773543 + 34360773544.

It is an arithmetic number, because the mean of its divisors is an integer number (34360773544).

Almost surely, 2^68721547087 is an apocalyptic number.

68721547087 is a deficient number, since it is larger than the sum of its proper divisors (1).

68721547087 is an equidigital number, since it uses as much as digits as its factorization.

68721547087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5268480, while the sum is 55.

The spelling of 68721547087 in words is "sixty-eight billion, seven hundred twenty-one million, five hundred forty-seven thousand, eighty-seven".