68509464197 has 2 divisors, whose sum is σ = 68509464198. Its totient is φ = 68509464196.

The previous prime is 68509464161. The next prime is 68509464241. The reversal of 68509464197 is 79146490586.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67565684356 + 943779841 = 259934^2 + 30721^2 .

It is a cyclic number.

It is not a de Polignac number, because 68509464197 - 2¹² = 68509460101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68509464157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34254732098 + 34254732099.

It is an arithmetic number, because the mean of its divisors is an integer number (34254732099).

Almost surely, 2^68509464197 is an apocalyptic number.

It is an amenable number.

68509464197 is a deficient number, since it is larger than the sum of its proper divisors (1).

68509464197 is an equidigital number, since it uses as much as digits as its factorization.

68509464197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13063680, while the sum is 59.

The spelling of 68509464197 in words is "sixty-eight billion, five hundred nine million, four hundred sixty-four thousand, one hundred ninety-seven".