67812918197 has 2 divisors, whose sum is σ = 67812918198. Its totient is φ = 67812918196.

The previous prime is 67812918161. The next prime is 67812918223. The reversal of 67812918197 is 79181921876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50697475921 + 17115442276 = 225161^2 + 130826^2 .

It is a cyclic number.

It is not a de Polignac number, because 67812918197 - 2¹⁰ = 67812917173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67812918137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33906459098 + 33906459099.

It is an arithmetic number, because the mean of its divisors is an integer number (33906459099).

Almost surely, 2^67812918197 is an apocalyptic number.

It is an amenable number.

67812918197 is a deficient number, since it is larger than the sum of its proper divisors (1).

67812918197 is an equidigital number, since it uses as much as digits as its factorization.

67812918197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3048192, while the sum is 59.

The spelling of 67812918197 in words is "sixty-seven billion, eight hundred twelve million, nine hundred eighteen thousand, one hundred ninety-seven".