68161193461 has 2 divisors, whose sum is σ = 68161193462. Its totient is φ = 68161193460.

The previous prime is 68161193437. The next prime is 68161193479. The reversal of 68161193461 is 16439116186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65328292836 + 2832900625 = 255594^2 + 53225^2 .

It is a cyclic number.

It is not a de Polignac number, because 68161193461 - 2⁹ = 68161192949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68161193491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34080596730 + 34080596731.

It is an arithmetic number, because the mean of its divisors is an integer number (34080596731).

Almost surely, 2^68161193461 is an apocalyptic number.

It is an amenable number.

68161193461 is a deficient number, since it is larger than the sum of its proper divisors (1).

68161193461 is an equidigital number, since it uses as much as digits as its factorization.

68161193461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 186624, while the sum is 46.

The spelling of 68161193461 in words is "sixty-eight billion, one hundred sixty-one million, one hundred ninety-three thousand, four hundred sixty-one".