75675282721 has 8 divisors (see below), whose sum is σ = 75991676040. Its totient is φ = 75359059968.

The previous prime is 75675282713. The next prime is 75675282751. The reversal of 75675282721 is 12728257657.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 6314686225 + 69360596496 = 79465^2 + 263364^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 75675282721 - 2³ = 75675282713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75675282751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 888865 + ... + 970273.

It is an arithmetic number, because the mean of its divisors is an integer number (9498959505).

Almost surely, 2^75675282721 is an apocalyptic number.

It is an amenable number.

75675282721 is a deficient number, since it is larger than the sum of its proper divisors (316393319).

75675282721 is a wasteful number, since it uses less digits than its factorization.

75675282721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85283.

The product of its digits is 3292800, while the sum is 52.

The spelling of 75675282721 in words is "seventy-five billion, six hundred seventy-five million, two hundred eighty-two thousand, seven hundred twenty-one".