521725012153897 has 2 divisors, whose sum is σ = 521725012153898. Its totient is φ = 521725012153896.

The previous prime is 521725012153861. The next prime is 521725012154011. The reversal of 521725012153897 is 798351210527125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 459813356541081 + 61911655612816 = 21443259^2 + 7868396^2 .

It is a cyclic number.

It is not a de Polignac number, because 521725012153897 - 2²³ = 521725003765289 is a prime.

It is not a weakly prime, because it can be changed into another prime (521725312153897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260862506076948 + 260862506076949.

It is an arithmetic number, because the mean of its divisors is an integer number (260862506076949).

Almost surely, 2^{521725012153897} is an apocalyptic number.

It is an amenable number.

521725012153897 is a deficient number, since it is larger than the sum of its proper divisors (1).

521725012153897 is an equidigital number, since it uses as much as digits as its factorization.

521725012153897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584000, while the sum is 58.

The spelling of 521725012153897 in words is "five hundred twenty-one trillion, seven hundred twenty-five billion, twelve million, one hundred fifty-three thousand, eight hundred ninety-seven".