75533503172173 has 2 divisors, whose sum is σ = 75533503172174. Its totient is φ = 75533503172172.

The previous prime is 75533503172147. The next prime is 75533503172207. The reversal of 75533503172173 is 37127130533557.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47230060442569 + 28303442729604 = 6872413^2 + 5320098^2 .

It is a cyclic number.

It is not a de Polignac number, because 75533503172173 - 2⁴⁵ = 40349131083341 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 75533503172173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75533503172573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37766751586086 + 37766751586087.

It is an arithmetic number, because the mean of its divisors is an integer number (37766751586087).

Almost surely, 2^{75533503172173} is an apocalyptic number.

It is an amenable number.

75533503172173 is a deficient number, since it is larger than the sum of its proper divisors (1).

75533503172173 is an equidigital number, since it uses as much as digits as its factorization.

75533503172173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6945750, while the sum is 52.

The spelling of 75533503172173 in words is "seventy-five trillion, five hundred thirty-three billion, five hundred three million, one hundred seventy-two thousand, one hundred seventy-three".