66623714355173 has 2 divisors, whose sum is σ = 66623714355174. Its totient is φ = 66623714355172.

The previous prime is 66623714355157. The next prime is 66623714355179. The reversal of 66623714355173 is 37155341732666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66457353971044 + 166360384129 = 8152138^2 + 407873^2 .

It is a cyclic number.

It is not a de Polignac number, because 66623714355173 - 2⁴ = 66623714355157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66623714355179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33311857177586 + 33311857177587.

It is an arithmetic number, because the mean of its divisors is an integer number (33311857177587).

Almost surely, 2^{66623714355173} is an apocalyptic number.

It is an amenable number.

66623714355173 is a deficient number, since it is larger than the sum of its proper divisors (1).

66623714355173 is an equidigital number, since it uses as much as digits as its factorization.

66623714355173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57153600, while the sum is 59.

The spelling of 66623714355173 in words is "sixty-six trillion, six hundred twenty-three billion, seven hundred fourteen million, three hundred fifty-five thousand, one hundred seventy-three".