75147568521 has 4 divisors (see below), whose sum is σ = 100196758032. Its totient is φ = 50098379012.

The previous prime is 75147568513. The next prime is 75147568523. The reversal of 75147568521 is 12586574157.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12586574157 = 3 ⋅4195524719.

It is a cyclic number.

It is not a de Polignac number, because 75147568521 - 2³ = 75147568513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (75147568523) 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, 12524594751 + ... + 12524594756.

It is an arithmetic number, because the mean of its divisors is an integer number (25049189508).

Almost surely, 2^75147568521 is an apocalyptic number.

It is an amenable number.

75147568521 is a deficient number, since it is larger than the sum of its proper divisors (25049189511).

75147568521 is a wasteful number, since it uses less digits than its factorization.

75147568521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25049189510.

The product of its digits is 2352000, while the sum is 51.

The spelling of 75147568521 in words is "seventy-five billion, one hundred forty-seven million, five hundred sixty-eight thousand, five hundred twenty-one".