1981137961763 has 2 divisors, whose sum is σ = 1981137961764. Its totient is φ = 1981137961762.

The previous prime is 1981137961753. The next prime is 1981137961819. The reversal of 1981137961763 is 3671697311891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1981137961763 - 2²⁰ = 1981136913187 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1981137961696 and 1981137961705.

It is not a weakly prime, because it can be changed into another prime (1981137961723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990568980881 + 990568980882.

It is an arithmetic number, because the mean of its divisors is an integer number (990568980882).

Almost surely, 2^{1981137961763} is an apocalyptic number.

1981137961763 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981137961763 is an equidigital number, since it uses as much as digits as its factorization.

1981137961763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 62.

The spelling of 1981137961763 in words is "one trillion, nine hundred eighty-one billion, one hundred thirty-seven million, nine hundred sixty-one thousand, seven hundred sixty-three".