1765981640389 has 2 divisors, whose sum is σ = 1765981640390. Its totient is φ = 1765981640388.

The previous prime is 1765981640329. The next prime is 1765981640431. The reversal of 1765981640389 is 9830461895671.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1508696324100 + 257285316289 = 1228290^2 + 507233^2 .

It is a cyclic number.

It is not a de Polignac number, because 1765981640389 - 2¹¹ = 1765981638341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1765981640309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 882990820194 + 882990820195.

It is an arithmetic number, because the mean of its divisors is an integer number (882990820195).

Almost surely, 2^{1765981640389} is an apocalyptic number.

It is an amenable number.

1765981640389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1765981640389 is an equidigital number, since it uses as much as digits as its factorization.

1765981640389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78382080, while the sum is 67.

The spelling of 1765981640389 in words is "one trillion, seven hundred sixty-five billion, nine hundred eighty-one million, six hundred forty thousand, three hundred eighty-nine".