74383205521 has 2 divisors, whose sum is σ = 74383205522. Its totient is φ = 74383205520.

The previous prime is 74383205513. The next prime is 74383205551. The reversal of 74383205521 is 12550238347.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71094756496 + 3288449025 = 266636^2 + 57345^2 .

It is a cyclic number.

It is not a de Polignac number, because 74383205521 - 2³ = 74383205513 is a prime.

It is a super-2 number, since 2×74383205521² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (74383205551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37191602760 + 37191602761.

It is an arithmetic number, because the mean of its divisors is an integer number (37191602761).

Almost surely, 2^74383205521 is an apocalyptic number.

It is an amenable number.

74383205521 is a deficient number, since it is larger than the sum of its proper divisors (1).

74383205521 is an equidigital number, since it uses as much as digits as its factorization.

74383205521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 74383205521 in words is "seventy-four billion, three hundred eighty-three million, two hundred five thousand, five hundred twenty-one".