75444604021 has 4 divisors (see below), whose sum is σ = 75880700172. Its totient is φ = 75008507872.

The previous prime is 75444603967. The next prime is 75444604043. The reversal of 75444604021 is 12040644457.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61340428900 + 14104175121 = 247670^2 + 118761^2 .

It is a cyclic number.

It is not a de Polignac number, because 75444604021 - 2⁷ = 75444603893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75444604051) 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 3 ways as a sum of consecutive naturals, for example, 218047816 + ... + 218048161.

It is an arithmetic number, because the mean of its divisors is an integer number (18970175043).

Almost surely, 2^75444604021 is an apocalyptic number.

It is an amenable number.

75444604021 is a deficient number, since it is larger than the sum of its proper divisors (436096151).

75444604021 is a wasteful number, since it uses less digits than its factorization.

75444604021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436096150.

The product of its (nonzero) digits is 107520, while the sum is 37.

The spelling of 75444604021 in words is "seventy-five billion, four hundred forty-four million, six hundred four thousand, twenty-one".