5681254661 has 2 divisors, whose sum is σ = 5681254662. Its totient is φ = 5681254660.

The previous prime is 5681254637. The next prime is 5681254697. The reversal of 5681254661 is 1664521865.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3340146436 + 2341108225 = 57794^2 + 48385^2 .

It is a cyclic number.

It is not a de Polignac number, because 5681254661 - 2⁶ = 5681254597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5681254261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2840627330 + 2840627331.

It is an arithmetic number, because the mean of its divisors is an integer number (2840627331).

Almost surely, 2^5681254661 is an apocalyptic number.

It is an amenable number.

5681254661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5681254661 is an equidigital number, since it uses as much as digits as its factorization.

5681254661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 345600, while the sum is 44.

The square root of 5681254661 is about 75374.0980775226. The cubic root of 5681254661 is about 1784.3556442605.

The spelling of 5681254661 in words is "five billion, six hundred eighty-one million, two hundred fifty-four thousand, six hundred sixty-one".