75412566521 has 4 divisors (see below), whose sum is σ = 75592549200. Its totient is φ = 75232583844.

The previous prime is 75412566479. The next prime is 75412566529. The reversal of 75412566521 is 12566521457.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 75412566521 - 2³⁴ = 58232697337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75412566529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89990711 + ... + 89991548.

It is an arithmetic number, because the mean of its divisors is an integer number (18898137300).

Almost surely, 2^75412566521 is an apocalyptic number.

It is an amenable number.

75412566521 is a deficient number, since it is larger than the sum of its proper divisors (179982679).

75412566521 is a wasteful number, since it uses less digits than its factorization.

75412566521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179982678.

The product of its digits is 504000, while the sum is 44.

The spelling of 75412566521 in words is "seventy-five billion, four hundred twelve million, five hundred sixty-six thousand, five hundred twenty-one".