78609040361 has 2 divisors, whose sum is σ = 78609040362. Its totient is φ = 78609040360.

The previous prime is 78609040343. The next prime is 78609040387. The reversal of 78609040361 is 16304090687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65200558336 + 13408482025 = 255344^2 + 115795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78609040361 is a prime.

It is not a weakly prime, because it can be changed into another prime (78609040061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39304520180 + 39304520181.

It is an arithmetic number, because the mean of its divisors is an integer number (39304520181).

Almost surely, 2^78609040361 is an apocalyptic number.

It is an amenable number.

78609040361 is a deficient number, since it is larger than the sum of its proper divisors (1).

78609040361 is an equidigital number, since it uses as much as digits as its factorization.

78609040361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 78609040361 in words is "seventy-eight billion, six hundred nine million, forty thousand, three hundred sixty-one".