68215456993 has 2 divisors, whose sum is σ = 68215456994. Its totient is φ = 68215456992.

The previous prime is 68215456931. The next prime is 68215457017. The reversal of 68215456993 is 39965451286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58746610129 + 9468846864 = 242377^2 + 97308^2 .

It is a cyclic number.

It is not a de Polignac number, because 68215456993 - 2¹⁷ = 68215325921 is a prime.

It is not a weakly prime, because it can be changed into another prime (68215456093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34107728496 + 34107728497.

It is an arithmetic number, because the mean of its divisors is an integer number (34107728497).

Almost surely, 2^68215456993 is an apocalyptic number.

It is an amenable number.

68215456993 is a deficient number, since it is larger than the sum of its proper divisors (1).

68215456993 is an equidigital number, since it uses as much as digits as its factorization.

68215456993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13996800, while the sum is 58.

The spelling of 68215456993 in words is "sixty-eight billion, two hundred fifteen million, four hundred fifty-six thousand, nine hundred ninety-three".