5661668138771 has 4 divisors (see below), whose sum is σ = 5661682626600. Its totient is φ = 5661653650944.

The previous prime is 5661668138767. The next prime is 5661668138851. The reversal of 5661668138771 is 1778318661665.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5661668138771 - 2² = 5661668138767 is a prime.

It is a super-2 number, since 2×5661668138771² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5661668138698 and 5661668138707.

It is not an unprimeable number, because it can be changed into a prime (5661668108771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6641006 + ... + 7444883.

It is an arithmetic number, because the mean of its divisors is an integer number (1415420656650).

Almost surely, 2^{5661668138771} is an apocalyptic number.

5661668138771 is a deficient number, since it is larger than the sum of its proper divisors (14487829).

5661668138771 is a wasteful number, since it uses less digits than its factorization.

5661668138771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14487828.

The product of its digits is 60963840, while the sum is 65.

The spelling of 5661668138771 in words is "five trillion, six hundred sixty-one billion, six hundred sixty-eight million, one hundred thirty-eight thousand, seven hundred seventy-one".