1391882668577 has 4 divisors (see below), whose sum is σ = 1391971628100. Its totient is φ = 1391793709056.

The previous prime is 1391882668571. The next prime is 1391882668607. The reversal of 1391882668577 is 7758662881931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 525253865536 + 866628803041 = 724744^2 + 930929^2 .

It is a cyclic number.

It is not a de Polignac number, because 1391882668577 - 2²⁰ = 1391881620001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1391882668577.

It is not an unprimeable number, because it can be changed into a prime (1391882668571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44456288 + ... + 44487585.

It is an arithmetic number, because the mean of its divisors is an integer number (347992907025).

Almost surely, 2^{1391882668577} is an apocalyptic number.

It is an amenable number.

1391882668577 is a deficient number, since it is larger than the sum of its proper divisors (88959523).

1391882668577 is an equidigital number, since it uses as much as digits as its factorization.

1391882668577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88959522.

The product of its digits is 243855360, while the sum is 71.

The spelling of 1391882668577 in words is "one trillion, three hundred ninety-one billion, eight hundred eighty-two million, six hundred sixty-eight thousand, five hundred seventy-seven".