725015174528221 has 2 divisors, whose sum is σ = 725015174528222. Its totient is φ = 725015174528220.

The previous prime is 725015174528173. The next prime is 725015174528243. The reversal of 725015174528221 is 122825471510527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 437207817535225 + 287807356992996 = 20909515^2 + 16964886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725015174528221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725015174528261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362507587264110 + 362507587264111.

It is an arithmetic number, because the mean of its divisors is an integer number (362507587264111).

Almost surely, 2^{725015174528221} is an apocalyptic number.

It is an amenable number.

725015174528221 is a deficient number, since it is larger than the sum of its proper divisors (1).

725015174528221 is an equidigital number, since it uses as much as digits as its factorization.

725015174528221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3136000, while the sum is 52.

The spelling of 725015174528221 in words is "seven hundred twenty-five trillion, fifteen billion, one hundred seventy-four million, five hundred twenty-eight thousand, two hundred twenty-one".