183866941561 has 2 divisors, whose sum is σ = 183866941562. Its totient is φ = 183866941560.

The previous prime is 183866941541. The next prime is 183866941567. The reversal of 183866941561 is 165149668381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97206768400 + 86660173161 = 311780^2 + 294381^2 .

It is an emirp because it is prime and its reverse (165149668381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 183866941561 - 2¹⁷ = 183866810489 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 183866941496 and 183866941505.

It is not a weakly prime, because it can be changed into another prime (183866941567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 91933470780 + 91933470781.

It is an arithmetic number, because the mean of its divisors is an integer number (91933470781).

Almost surely, 2^183866941561 is an apocalyptic number.

It is an amenable number.

183866941561 is a deficient number, since it is larger than the sum of its proper divisors (1).

183866941561 is an equidigital number, since it uses as much as digits as its factorization.

183866941561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 58.

The spelling of 183866941561 in words is "one hundred eighty-three billion, eight hundred sixty-six million, nine hundred forty-one thousand, five hundred sixty-one".