74335053521 has 2 divisors, whose sum is σ = 74335053522. Its totient is φ = 74335053520.

The previous prime is 74335053491. The next prime is 74335053557. The reversal of 74335053521 is 12535053347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39298701121 + 35036352400 = 198239^2 + 187180^2 .

It is an emirp because it is prime and its reverse (12535053347) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74335053521 is a prime.

It is not a weakly prime, because it can be changed into another prime (74335053571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37167526760 + 37167526761.

It is an arithmetic number, because the mean of its divisors is an integer number (37167526761).

Almost surely, 2^74335053521 is an apocalyptic number.

It is an amenable number.

74335053521 is a deficient number, since it is larger than the sum of its proper divisors (1).

74335053521 is an equidigital number, since it uses as much as digits as its factorization.

74335053521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189000, while the sum is 38.

The spelling of 74335053521 in words is "seventy-four billion, three hundred thirty-five million, fifty-three thousand, five hundred twenty-one".