1185681149561 has 2 divisors, whose sum is σ = 1185681149562. Its totient is φ = 1185681149560.

The previous prime is 1185681149539. The next prime is 1185681149593. The reversal of 1185681149561 is 1659411865811.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1151629459600 + 34051689961 = 1073140^2 + 184531^2 .

It is a cyclic number.

It is not a de Polignac number, because 1185681149561 - 2¹⁰ = 1185681148537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1185681149497 and 1185681149506.

It is not a weakly prime, because it can be changed into another prime (1185681143561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 592840574780 + 592840574781.

It is an arithmetic number, because the mean of its divisors is an integer number (592840574781).

Almost surely, 2^{1185681149561} is an apocalyptic number.

It is an amenable number.

1185681149561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1185681149561 is an equidigital number, since it uses as much as digits as its factorization.

1185681149561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 56.

The spelling of 1185681149561 in words is "one trillion, one hundred eighty-five billion, six hundred eighty-one million, one hundred forty-nine thousand, five hundred sixty-one".