75457328921 has 8 divisors (see below), whose sum is σ = 81286269120. Its totient is φ = 69631893072.

The previous prime is 75457328917. The next prime is 75457328923. The reversal of 75457328921 is 12982375457.

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 75457328921 - 2² = 75457328917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (75457328923) 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 7 ways as a sum of consecutive naturals, for example, 831275 + ... + 917568.

It is an arithmetic number, because the mean of its divisors is an integer number (10160783640).

Almost surely, 2^75457328921 is an apocalyptic number.

It is an amenable number.

75457328921 is a deficient number, since it is larger than the sum of its proper divisors (5828940199).

75457328921 is a wasteful number, since it uses less digits than its factorization.

75457328921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752175.

The product of its digits is 4233600, while the sum is 53.

The spelling of 75457328921 in words is "seventy-five billion, four hundred fifty-seven million, three hundred twenty-eight thousand, nine hundred twenty-one".