525854651221 has 2 divisors, whose sum is σ = 525854651222. Its totient is φ = 525854651220.

The previous prime is 525854651167. The next prime is 525854651263. The reversal of 525854651221 is 122156458525.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 442904891121 + 82949760100 = 665511^2 + 288010^2 .

It is a cyclic number.

It is not a de Polignac number, because 525854651221 - 2⁷ = 525854651093 is a prime.

It is a super-3 number, since 3×525854651221³ (a number of 36 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (525854651321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 262927325610 + 262927325611.

It is an arithmetic number, because the mean of its divisors is an integer number (262927325611).

Almost surely, 2^525854651221 is an apocalyptic number.

It is an amenable number.

525854651221 is a deficient number, since it is larger than the sum of its proper divisors (1).

525854651221 is an equidigital number, since it uses as much as digits as its factorization.

525854651221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 960000, while the sum is 46.

The spelling of 525854651221 in words is "five hundred twenty-five billion, eight hundred fifty-four million, six hundred fifty-one thousand, two hundred twenty-one".