797410215521 has 4 divisors (see below), whose sum is σ = 800718971844. Its totient is φ = 794101459200.

The previous prime is 797410215463. The next prime is 797410215541. The reversal of 797410215521 is 125512014797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 125512014797 = 13 ⋅9654770369.

It can be written as a sum of positive squares in 2 ways, for example, as 694263900625 + 103146314896 = 833225^2 + 321164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-797410215521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (797410215541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1654377800 + ... + 1654378281.

It is an arithmetic number, because the mean of its divisors is an integer number (200179742961).

Almost surely, 2^797410215521 is an apocalyptic number.

It is an amenable number.

797410215521 is a deficient number, since it is larger than the sum of its proper divisors (3308756323).

797410215521 is a wasteful number, since it uses less digits than its factorization.

797410215521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3308756322.

The product of its (nonzero) digits is 176400, while the sum is 44.

The spelling of 797410215521 in words is "seven hundred ninety-seven billion, four hundred ten million, two hundred fifteen thousand, five hundred twenty-one".