39988966684493 has 2 divisors, whose sum is σ = 39988966684494. Its totient is φ = 39988966684492.

The previous prime is 39988966684439. The next prime is 39988966684607. The reversal of 39988966684493 is 39448666988993.

Together with previous prime (39988966684439) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39988966684489 + 4 = 6323683^2 + 2^2 .

It is a cyclic number.

It is not a de Polignac number, because 39988966684493 - 2¹⁴ = 39988966668109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39988966684193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19994483342246 + 19994483342247.

It is an arithmetic number, because the mean of its divisors is an integer number (19994483342247).

Almost surely, 2^{39988966684493} is an apocalyptic number.

It is an amenable number.

39988966684493 is a deficient number, since it is larger than the sum of its proper divisors (1).

39988966684493 is an equidigital number, since it uses as much as digits as its factorization.

39988966684493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104485552128, while the sum is 92.

The spelling of 39988966684493 in words is "thirty-nine trillion, nine hundred eighty-eight billion, nine hundred sixty-six million, six hundred eighty-four thousand, four hundred ninety-three".