10091816783981 has 2 divisors, whose sum is σ = 10091816783982. Its totient is φ = 10091816783980.

The previous prime is 10091816783861. The next prime is 10091816784013. The reversal of 10091816783981 is 18938761819001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8398606861225 + 1693209922756 = 2898035^2 + 1301234^2 .

It is a cyclic number.

It is not a de Polignac number, because 10091816783981 - 2¹⁸ = 10091816521837 is a prime.

It is a super-2 number, since 2×10091816783981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10091816723981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5045908391990 + 5045908391991.

It is an arithmetic number, because the mean of its divisors is an integer number (5045908391991).

Almost surely, 2^{10091816783981} is an apocalyptic number.

It is an amenable number.

10091816783981 is a deficient number, since it is larger than the sum of its proper divisors (1).

10091816783981 is an equidigital number, since it uses as much as digits as its factorization.

10091816783981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5225472, while the sum is 62.

The spelling of 10091816783981 in words is "ten trillion, ninety-one billion, eight hundred sixteen million, seven hundred eighty-three thousand, nine hundred eighty-one".