1981837983679 has 2 divisors, whose sum is σ = 1981837983680. Its totient is φ = 1981837983678.

The previous prime is 1981837983613. The next prime is 1981837983739. The reversal of 1981837983679 is 9763897381891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1981837983679 - 2¹¹ = 1981837981631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1981837983599 and 1981837983608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1981837983379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 990918991839 + 990918991840.

It is an arithmetic number, because the mean of its divisors is an integer number (990918991840).

Almost surely, 2^{1981837983679} is an apocalyptic number.

1981837983679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1981837983679 is an equidigital number, since it uses as much as digits as its factorization.

1981837983679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987614208, while the sum is 79.

The spelling of 1981837983679 in words is "one trillion, nine hundred eighty-one billion, eight hundred thirty-seven million, nine hundred eighty-three thousand, six hundred seventy-nine".