526722221521 has 4 divisors (see below), whose sum is σ = 526723966372. Its totient is φ = 526720476672.

The previous prime is 526722221453. The next prime is 526722221549. The reversal of 526722221521 is 125122227625.

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 525161102400 + 1561119121 = 724680^2 + 39511^2 .

It is a cyclic number.

It is not a de Polignac number, because 526722221521 - 2⁷ = 526722221393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (526726221521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290016 + ... + 1066561.

It is an arithmetic number, because the mean of its divisors is an integer number (131680991593).

Almost surely, 2^526722221521 is an apocalyptic number.

It is an amenable number.

526722221521 is a deficient number, since it is larger than the sum of its proper divisors (1744851).

526722221521 is a wasteful number, since it uses less digits than its factorization.

526722221521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744850.

The product of its digits is 67200, while the sum is 37.

The spelling of 526722221521 in words is "five hundred twenty-six billion, seven hundred twenty-two million, two hundred twenty-one thousand, five hundred twenty-one".