725224643858 has 54 divisors (see below), whose sum is σ = 1295083033461. Its totient is φ = 304217799600.

The previous prime is 725224643849. The next prime is 725224643863. The reversal of 725224643858 is 858346422527.

It can be written as a sum of positive squares in 2 ways, for example, as 620088526849 + 105136117009 = 787457^2 + 324247^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=602173.

It is a Duffinian number.

It is an unprimeable number.

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 in 26 ways as a sum of consecutive naturals, for example, 172219373 + ... + 172223583.

Almost surely, 2^725224643858 is an apocalyptic number.

725224643858 is a deficient number, since it is larger than the sum of its proper divisors (569858389603).

725224643858 is an equidigital number, since it uses as much as digits as its factorization.

725224643858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8472 (or 4237 counting only the distinct ones).

The product of its digits is 25804800, while the sum is 56.

The spelling of 725224643858 in words is "seven hundred twenty-five billion, two hundred twenty-four million, six hundred forty-three thousand, eight hundred fifty-eight".