75365736231521 has 2 divisors, whose sum is σ = 75365736231522. Its totient is φ = 75365736231520.

The previous prime is 75365736231473. The next prime is 75365736231529. The reversal of 75365736231521 is 12513263756357.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75338233657600 + 27502573921 = 8679760^2 + 165839^2 .

It is a cyclic number.

It is not a de Polignac number, because 75365736231521 - 2³⁴ = 75348556362337 is a prime.

It is not a weakly prime, because it can be changed into another prime (75365736231529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37682868115760 + 37682868115761.

It is an arithmetic number, because the mean of its divisors is an integer number (37682868115761).

Almost surely, 2^{75365736231521} is an apocalyptic number.

It is an amenable number.

75365736231521 is a deficient number, since it is larger than the sum of its proper divisors (1).

75365736231521 is an equidigital number, since it uses as much as digits as its factorization.

75365736231521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23814000, while the sum is 56.

Adding to 75365736231521 its reverse (12513263756357), we get a palindrome (87878999987878).

The spelling of 75365736231521 in words is "seventy-five trillion, three hundred sixty-five billion, seven hundred thirty-six million, two hundred thirty-one thousand, five hundred twenty-one".