6181260661 has 2 divisors, whose sum is σ = 6181260662. Its totient is φ = 6181260660.

The previous prime is 6181260647. The next prime is 6181260677. The reversal of 6181260661 is 1660621816.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4596026436 + 1585234225 = 67794^2 + 39815^2 .

It is a cyclic number.

It is not a de Polignac number, because 6181260661 - 2⁹ = 6181260149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6181260661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6181260641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3090630330 + 3090630331.

It is an arithmetic number, because the mean of its divisors is an integer number (3090630331).

Almost surely, 2^6181260661 is an apocalyptic number.

It is an amenable number.

6181260661 is a deficient number, since it is larger than the sum of its proper divisors (1).

6181260661 is an equidigital number, since it uses as much as digits as its factorization.

6181260661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 6181260661 is about 78620.9937675682. The cubic root of 6181260661 is about 1835.2378293311.

The spelling of 6181260661 in words is "six billion, one hundred eighty-one million, two hundred sixty thousand, six hundred sixty-one".