79526960648521 has 3 divisors (see below), whose sum is σ = 79526969566311. Its totient is φ = 79526951730732.

The previous prime is 79526960648479. The next prime is 79526960648537. The reversal of 79526960648521 is 12584606962597.

The square root of 79526960648521 is 8917789.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 32974564921 + 79493986083600 = 181589^2 + 8915940^2 .

It is not a de Polignac number, because 79526960648521 - 2¹³ = 79526960640329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79526960648591) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4458895 + ... + 13376683.

It is an arithmetic number, because the mean of its divisors is an integer number (26508989855437).

Almost surely, 2^{79526960648521} is an apocalyptic number.

79526960648521 is the 8917789-th square number.

79526960648521 is the 4458895-th centered octagonal number.

It is an amenable number.

79526960648521 is a deficient number, since it is larger than the sum of its proper divisors (8917790).

79526960648521 is an frugal number, since it uses more digits than its factorization.

79526960648521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17835578 (or 8917789 counting only the distinct ones).

The product of its (nonzero) digits is 391910400, while the sum is 70.

The spelling of 79526960648521 in words is "seventy-nine trillion, five hundred twenty-six billion, nine hundred sixty million, six hundred forty-eight thousand, five hundred twenty-one".