2448661581 has 24 divisors (see below), whose sum is σ = 3693580800. Its totient is φ = 1560262176.

The previous prime is 2448661543. The next prime is 2448661597. The reversal of 2448661581 is 1851668442.

It is a happy number.

2448661581 is a `hidden beast` number, since 2 + 4 + 4 + 8 + 6 + 61 + 581 = 666.

It is not a de Polignac number, because 2448661581 - 2²⁷ = 2314443853 is a prime.

It is a super-2 number, since 2×2448661581² = 11991887076530839122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2448661781) 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 23 ways as a sum of consecutive naturals, for example, 320595 + ... + 328143.

It is an arithmetic number, because the mean of its divisors is an integer number (153899200).

Almost surely, 2^2448661581 is an apocalyptic number.

It is an amenable number.

2448661581 is a deficient number, since it is larger than the sum of its proper divisors (1244919219).

2448661581 is a wasteful number, since it uses less digits than its factorization.

2448661581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9145 (or 9142 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 2448661581 is about 49483.9527624865. The cubic root of 2448661581 is about 1347.8542191421.

The spelling of 2448661581 in words is "two billion, four hundred forty-eight million, six hundred sixty-one thousand, five hundred eighty-one".