1973705944681 has 2 divisors, whose sum is σ = 1973705944682. Its totient is φ = 1973705944680.

The previous prime is 1973705944603. The next prime is 1973705944697. The reversal of 1973705944681 is 1864495073791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1207877931225 + 765828013456 = 1099035^2 + 875116^2 .

It is a cyclic number.

It is not a de Polignac number, because 1973705944681 - 2²¹ = 1973703847529 is a prime.

It is a super-2 number, since 2×1973705944681² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1973705914681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 986852972340 + 986852972341.

It is an arithmetic number, because the mean of its divisors is an integer number (986852972341).

Almost surely, 2^{1973705944681} is an apocalyptic number.

It is an amenable number.

1973705944681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1973705944681 is an equidigital number, since it uses as much as digits as its factorization.

1973705944681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45722880, while the sum is 64.

The spelling of 1973705944681 in words is "one trillion, nine hundred seventy-three billion, seven hundred five million, nine hundred forty-four thousand, six hundred eighty-one".