7881257191579 has 2 divisors, whose sum is σ = 7881257191580. Its totient is φ = 7881257191578.

The previous prime is 7881257191571. The next prime is 7881257191583. The reversal of 7881257191579 is 9751917521887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 7881257191579 - 2³ = 7881257191571 is a prime.

It is a super-2 number, since 2×7881257191579² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7881257191571) 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, 3940628595789 + 3940628595790.

It is an arithmetic number, because the mean of its divisors is an integer number (3940628595790).

Almost surely, 2^{7881257191579} is an apocalyptic number.

7881257191579 is a deficient number, since it is larger than the sum of its proper divisors (1).

7881257191579 is an equidigital number, since it uses as much as digits as its factorization.

7881257191579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88905600, while the sum is 70.

The spelling of 7881257191579 in words is "seven trillion, eight hundred eighty-one billion, two hundred fifty-seven million, one hundred ninety-one thousand, five hundred seventy-nine".