17881241012461 has 2 divisors, whose sum is σ = 17881241012462. Its totient is φ = 17881241012460.

The previous prime is 17881241012419. The next prime is 17881241012471. The reversal of 17881241012461 is 16421014218871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15881898744100 + 1999342268361 = 3985210^2 + 1413981^2 .

It is an emirp because it is prime and its reverse (16421014218871) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17881241012461 - 2³⁷ = 17743802058989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17881241012471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8940620506230 + 8940620506231.

It is an arithmetic number, because the mean of its divisors is an integer number (8940620506231).

Almost surely, 2^{17881241012461} is an apocalyptic number.

It is an amenable number.

17881241012461 is a deficient number, since it is larger than the sum of its proper divisors (1).

17881241012461 is an equidigital number, since it uses as much as digits as its factorization.

17881241012461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172032, while the sum is 46.

The spelling of 17881241012461 in words is "seventeen trillion, eight hundred eighty-one billion, two hundred forty-one million, twelve thousand, four hundred sixty-one".