5661881390 has 16 divisors (see below), whose sum is σ = 11117876400. Its totient is φ = 2058865920.

The previous prime is 5661881341. The next prime is 5661881473. The reversal of 5661881390 is 931881665.

It is a congruent number.

It is an unprimeable number.

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, 25735715 + ... + 25735934.

It is an arithmetic number, because the mean of its divisors is an integer number (694867275).

Almost surely, 2^5661881390 is an apocalyptic number.

5661881390 is a deficient number, since it is larger than the sum of its proper divisors (5455995010).

5661881390 is a wasteful number, since it uses less digits than its factorization.

5661881390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51471667.

The product of its (nonzero) digits is 311040, while the sum is 47.

The square root of 5661881390 is about 75245.4742160617. The cubic root of 5661881390 is about 1782.3250966831.

The spelling of 5661881390 in words is "five billion, six hundred sixty-one million, eight hundred eighty-one thousand, three hundred ninety".