7981792581397 has 2 divisors, whose sum is σ = 7981792581398. Its totient is φ = 7981792581396.

The previous prime is 7981792581313. The next prime is 7981792581409. The reversal of 7981792581397 is 7931852971897.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7805044650001 + 176747931396 = 2793751^2 + 420414^2 .

It is an emirp because it is prime and its reverse (7931852971897) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7981792581397 - 2³⁵ = 7947432843029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7981792581097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3990896290698 + 3990896290699.

It is an arithmetic number, because the mean of its divisors is an integer number (3990896290699).

Almost surely, 2^{7981792581397} is an apocalyptic number.

It is an amenable number.

7981792581397 is a deficient number, since it is larger than the sum of its proper divisors (1).

7981792581397 is an equidigital number, since it uses as much as digits as its factorization.

7981792581397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 480090240, while the sum is 76.

The spelling of 7981792581397 in words is "seven trillion, nine hundred eighty-one billion, seven hundred ninety-two million, five hundred eighty-one thousand, three hundred ninety-seven".