12340578729173 has 2 divisors, whose sum is σ = 12340578729174. Its totient is φ = 12340578729172.

The previous prime is 12340578729169. The next prime is 12340578729221. The reversal of 12340578729173 is 37192787504321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12340480461604 + 98267569 = 3512902^2 + 9913^2 .

It is a cyclic number.

It is not a de Polignac number, because 12340578729173 - 2² = 12340578729169 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12340578729133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6170289364586 + 6170289364587.

It is an arithmetic number, because the mean of its divisors is an integer number (6170289364587).

Almost surely, 2^{12340578729173} is an apocalyptic number.

It is an amenable number.

12340578729173 is a deficient number, since it is larger than the sum of its proper divisors (1).

12340578729173 is an equidigital number, since it uses as much as digits as its factorization.

12340578729173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17781120, while the sum is 59.

The spelling of 12340578729173 in words is "twelve trillion, three hundred forty billion, five hundred seventy-eight million, seven hundred twenty-nine thousand, one hundred seventy-three".