75465350066521 has 4 divisors (see below), whose sum is σ = 76889224596132. Its totient is φ = 74041475536912.

The previous prime is 75465350066507. The next prime is 75465350066563. The reversal of 75465350066521 is 12566005356457.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30349477649296 + 45115872417225 = 5509036^2 + 6716835^2 .

It is a cyclic number.

It is not a de Polignac number, because 75465350066521 - 2¹¹ = 75465350064473 is a prime.

It is a super-2 number, since 2×75465350066521² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75465350066581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 711937264726 + ... + 711937264831.

It is an arithmetic number, because the mean of its divisors is an integer number (19222306149033).

Almost surely, 2^{75465350066521} is an apocalyptic number.

It is an amenable number.

75465350066521 is a deficient number, since it is larger than the sum of its proper divisors (1423874529611).

75465350066521 is a wasteful number, since it uses less digits than its factorization.

75465350066521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423874529610.

The product of its (nonzero) digits is 22680000, while the sum is 55.

The spelling of 75465350066521 in words is "seventy-five trillion, four hundred sixty-five billion, three hundred fifty million, sixty-six thousand, five hundred twenty-one".