5781299661 has 12 divisors (see below), whose sum is σ = 8366209020. Its totient is φ = 3847072320.

The previous prime is 5781299659. The next prime is 5781299677. The reversal of 5781299661 is 1669921875.

5781299661 is a `hidden beast` number, since 578 + 1 + 2 + 9 + 9 + 6 + 61 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1062434025 + 4718865636 = 32595^2 + 68694^2 .

It is not a de Polignac number, because 5781299661 - 2¹ = 5781299659 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5781299598 and 5781299607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5781299761) 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 11 ways as a sum of consecutive naturals, for example, 588816 + ... + 598553.

It is an arithmetic number, because the mean of its divisors is an integer number (697184085).

Almost surely, 2^5781299661 is an apocalyptic number.

It is an amenable number.

5781299661 is a deficient number, since it is larger than the sum of its proper divisors (2584909359).

5781299661 is a wasteful number, since it uses less digits than its factorization.

5781299661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187916 (or 1187913 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 5781299661 is about 76034.8581967508. The cubic root of 5781299661 is about 1794.7687270152.

The spelling of 5781299661 in words is "five billion, seven hundred eighty-one million, two hundred ninety-nine thousand, six hundred sixty-one".