17661849481 has 2 divisors, whose sum is σ = 17661849482. Its totient is φ = 17661849480.

The previous prime is 17661849473. The next prime is 17661849607. The reversal of 17661849481 is 18494816671.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11339055225 + 6322794256 = 106485^2 + 79516^2 .

It is a cyclic number.

It is not a de Polignac number, because 17661849481 - 2³ = 17661849473 is a prime.

It is a super-2 number, since 2×17661849481² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (17661849421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8830924740 + 8830924741.

It is an arithmetic number, because the mean of its divisors is an integer number (8830924741).

Almost surely, 2^17661849481 is an apocalyptic number.

It is an amenable number.

17661849481 is a deficient number, since it is larger than the sum of its proper divisors (1).

17661849481 is an equidigital number, since it uses as much as digits as its factorization.

17661849481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2322432, while the sum is 55.

The spelling of 17661849481 in words is "seventeen billion, six hundred sixty-one million, eight hundred forty-nine thousand, four hundred eighty-one".