74223857581 has 8 divisors (see below), whose sum is σ = 74291284760. Its totient is φ = 74156461632.

The previous prime is 74223857569. The next prime is 74223857663. The reversal of 74223857581 is 18575832247.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4241916900 + 69981940681 = 65130^2 + 264541^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 74223857581 - 2³³ = 65633922989 is a prime.

It is a super-2 number, since 2×74223857581² (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 (74223857501) 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 7 ways as a sum of consecutive naturals, for example, 8143855 + ... + 8152963.

It is an arithmetic number, because the mean of its divisors is an integer number (9286410595).

Almost surely, 2^74223857581 is an apocalyptic number.

It is an amenable number.

74223857581 is a deficient number, since it is larger than the sum of its proper divisors (67427179).

74223857581 is a wasteful number, since it uses less digits than its factorization.

74223857581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15615.

The product of its digits is 3763200, while the sum is 52.

The spelling of 74223857581 in words is "seventy-four billion, two hundred twenty-three million, eight hundred fifty-seven thousand, five hundred eighty-one".