18715125173 has 2 divisors, whose sum is σ = 18715125174. Its totient is φ = 18715125172.

The previous prime is 18715125151. The next prime is 18715125179. The reversal of 18715125173 is 37152151781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10448315089 + 8266810084 = 102217^2 + 90922^2 .

It is a cyclic number.

It is not a de Polignac number, because 18715125173 - 2¹² = 18715121077 is a prime.

It is a super-3 number, since 3×18715125173³ (a number of 32 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18715125173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18715125179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9357562586 + 9357562587.

It is an arithmetic number, because the mean of its divisors is an integer number (9357562587).

Almost surely, 2^18715125173 is an apocalyptic number.

It is an amenable number.

18715125173 is a deficient number, since it is larger than the sum of its proper divisors (1).

18715125173 is an equidigital number, since it uses as much as digits as its factorization.

18715125173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 41.

The spelling of 18715125173 in words is "eighteen billion, seven hundred fifteen million, one hundred twenty-five thousand, one hundred seventy-three".