75188517121 has 2 divisors, whose sum is σ = 75188517122. Its totient is φ = 75188517120.

The previous prime is 75188517097. The next prime is 75188517139. The reversal of 75188517121 is 12171588157.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74808267121 + 380250000 = 273511^2 + 19500^2 .

It is a cyclic number.

It is not a de Polignac number, because 75188517121 - 2⁷ = 75188516993 is a prime.

It is not a weakly prime, because it can be changed into another prime (75188517191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37594258560 + 37594258561.

It is an arithmetic number, because the mean of its divisors is an integer number (37594258561).

Almost surely, 2^75188517121 is an apocalyptic number.

It is an amenable number.

75188517121 is a deficient number, since it is larger than the sum of its proper divisors (1).

75188517121 is an equidigital number, since it uses as much as digits as its factorization.

75188517121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 156800, while the sum is 46.

The spelling of 75188517121 in words is "seventy-five billion, one hundred eighty-eight million, five hundred seventeen thousand, one hundred twenty-one".