75294742521 has 4 divisors (see below), whose sum is σ = 100392990032. Its totient is φ = 50196495012.

The previous prime is 75294742487. The next prime is 75294742571. The reversal of 75294742521 is 12524749257.

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 not a de Polignac number, because 75294742521 - 2²⁷ = 75160524793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75294742571) 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, 12549123751 + ... + 12549123756.

It is an arithmetic number, because the mean of its divisors is an integer number (25098247508).

Almost surely, 2^75294742521 is an apocalyptic number.

It is an amenable number.

75294742521 is a deficient number, since it is larger than the sum of its proper divisors (25098247511).

75294742521 is a wasteful number, since it uses less digits than its factorization.

75294742521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25098247510.

The product of its digits is 1411200, while the sum is 48.

The spelling of 75294742521 in words is "seventy-five billion, two hundred ninety-four million, seven hundred forty-two thousand, five hundred twenty-one".