61666186163 has 2 divisors, whose sum is σ = 61666186164. Its totient is φ = 61666186162.

The previous prime is 61666186133. The next prime is 61666186171. The reversal of 61666186163 is 36168166616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61666186163 - 2²⁸ = 61397750707 is a prime.

It is not a weakly prime, because it can be changed into another prime (61666186133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30833093081 + 30833093082.

It is an arithmetic number, because the mean of its divisors is an integer number (30833093082).

Almost surely, 2^61666186163 is an apocalyptic number.

61666186163 is a deficient number, since it is larger than the sum of its proper divisors (1).

61666186163 is an equidigital number, since it uses as much as digits as its factorization.

61666186163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 50.

The spelling of 61666186163 in words is "sixty-one billion, six hundred sixty-six million, one hundred eighty-six thousand, one hundred sixty-three".