74920868581 has 12 divisors (see below), whose sum is σ = 81194434788. Its totient is φ = 69100521984.

The previous prime is 74920868579. The next prime is 74920868599. The reversal of 74920868581 is 18586802947.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 26604872100 + 48315996481 = 163110^2 + 219809^2 .

It is not a de Polignac number, because 74920868581 - 2¹ = 74920868579 is a prime.

It is a super-2 number, since 2×74920868581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74920868501) 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 11 ways as a sum of consecutive naturals, for example, 22261 + ... + 387733.

It is an arithmetic number, because the mean of its divisors is an integer number (6766202899).

Almost surely, 2^74920868581 is an apocalyptic number.

It is an amenable number.

74920868581 is a deficient number, since it is larger than the sum of its proper divisors (6273566207).

74920868581 is a wasteful number, since it uses less digits than its factorization.

74920868581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366712 (or 366699 counting only the distinct ones).

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 74920868581 in words is "seventy-four billion, nine hundred twenty million, eight hundred sixty-eight thousand, five hundred eighty-one".