525534522555221 has 4 divisors (see below), whose sum is σ = 525534803263500. Its totient is φ = 525534241846944.

The previous prime is 525534522555187. The next prime is 525534522555233. The reversal of 525534522555221 is 122555225435525.

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 86808613288996 + 438725909266225 = 9317114^2 + 20945785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-525534522555221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525534522555241) 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, 137526896 + ... + 141296553.

It is an arithmetic number, because the mean of its divisors is an integer number (131383700815875).

Almost surely, 2^{525534522555221} is an apocalyptic number.

It is an amenable number.

525534522555221 is a deficient number, since it is larger than the sum of its proper divisors (280708279).

525534522555221 is a wasteful number, since it uses less digits than its factorization.

525534522555221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280708278.

The product of its digits is 30000000, while the sum is 53.

The spelling of 525534522555221 in words is "five hundred twenty-five trillion, five hundred thirty-four billion, five hundred twenty-two million, five hundred fifty-five thousand, two hundred twenty-one".