1186420008661 has 2 divisors, whose sum is σ = 1186420008662. Its totient is φ = 1186420008660.

The previous prime is 1186420008617. The next prime is 1186420008677. The reversal of 1186420008661 is 1668000246811.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 691402228036 + 495017780625 = 831506^2 + 703575^2 .

It is a cyclic number.

It is not a de Polignac number, because 1186420008661 - 2⁹ = 1186420008149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1186420008601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 593210004330 + 593210004331.

It is an arithmetic number, because the mean of its divisors is an integer number (593210004331).

Almost surely, 2^{1186420008661} is an apocalyptic number.

It is an amenable number.

1186420008661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1186420008661 is an equidigital number, since it uses as much as digits as its factorization.

1186420008661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 43.

The spelling of 1186420008661 in words is "one trillion, one hundred eighty-six billion, four hundred twenty million, eight thousand, six hundred sixty-one".