725625557 has 2 divisors, whose sum is σ = 725625558. Its totient is φ = 725625556.

The previous prime is 725625533. The next prime is 725625613. The reversal of 725625557 is 755526527.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 486026116 + 239599441 = 22046^2 + 15479^2 .

It is a cyclic number.

It is not a de Polignac number, because 725625557 - 2⁶ = 725625493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (725625157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 362812778 + 362812779.

It is an arithmetic number, because the mean of its divisors is an integer number (362812779).

Almost surely, 2^725625557 is an apocalyptic number.

It is an amenable number.

725625557 is a deficient number, since it is larger than the sum of its proper divisors (1).

725625557 is an equidigital number, since it uses as much as digits as its factorization.

725625557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 735000, while the sum is 44.

The square root of 725625557 is about 26937.4378328749. The cubic root of 725625557 is about 898.6091921625.

The spelling of 725625557 in words is "seven hundred twenty-five million, six hundred twenty-five thousand, five hundred fifty-seven".