73504859621 has 2 divisors, whose sum is σ = 73504859622. Its totient is φ = 73504859620.

The previous prime is 73504859581. The next prime is 73504859633. The reversal of 73504859621 is 12695840537.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71765052100 + 1739807521 = 267890^2 + 41711^2 .

It is an emirp because it is prime and its reverse (12695840537) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73504859621 - 2³⁰ = 72431117797 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 73504859621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73504859321) 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 as a sum of consecutive naturals, namely, 36752429810 + 36752429811.

It is an arithmetic number, because the mean of its divisors is an integer number (36752429811).

It is a 1-persistent number, because it is pandigital, but 2⋅73504859621 = 147009719242 is not.

Almost surely, 2^73504859621 is an apocalyptic number.

It is an amenable number.

73504859621 is a deficient number, since it is larger than the sum of its proper divisors (1).

73504859621 is an equidigital number, since it uses as much as digits as its factorization.

73504859621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 73504859621 in words is "seventy-three billion, five hundred four million, eight hundred fifty-nine thousand, six hundred twenty-one".