521725012154069 has 2 divisors, whose sum is σ = 521725012154070. Its totient is φ = 521725012154068.

The previous prime is 521725012154011. The next prime is 521725012154113. The reversal of 521725012154069 is 960451210527125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 439418566309969 + 82306445844100 = 20962313^2 + 9072290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521725012154069 is a prime.

It is a super-2 number, since 2×521725012154069² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521725012154869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260862506077034 + 260862506077035.

It is an arithmetic number, because the mean of its divisors is an integer number (260862506077035).

Almost surely, 2^{521725012154069} is an apocalyptic number.

It is an amenable number.

521725012154069 is a deficient number, since it is larger than the sum of its proper divisors (1).

521725012154069 is an equidigital number, since it uses as much as digits as its factorization.

521725012154069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512000, while the sum is 50.

The spelling of 521725012154069 in words is "five hundred twenty-one trillion, seven hundred twenty-five billion, twelve million, one hundred fifty-four thousand, sixty-nine".