725556445 has 4 divisors (see below), whose sum is σ = 870667740. Its totient is φ = 580445152.

The previous prime is 725556409. The next prime is 725556449. The reversal of 725556445 is 544655527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 544655527 = 13 ⋅41896579.

It can be written as a sum of positive squares in 2 ways, for example, as 304362916 + 421193529 = 17446^2 + 20523^2 .

It is a cyclic number.

It is not a de Polignac number, because 725556445 - 2⁷ = 725556317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725556449) 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 in 3 ways as a sum of consecutive naturals, for example, 72555640 + ... + 72555649.

It is an arithmetic number, because the mean of its divisors is an integer number (217666935).

Almost surely, 2^725556445 is an apocalyptic number.

It is an amenable number.

725556445 is a deficient number, since it is larger than the sum of its proper divisors (145111295).

725556445 is a wasteful number, since it uses less digits than its factorization.

725556445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145111294.

The product of its digits is 840000, while the sum is 43.

The square root of 725556445 is about 26936.1549780216. The cubic root of 725556445 is about 898.5806619977.

The spelling of 725556445 in words is "seven hundred twenty-five million, five hundred fifty-six thousand, four hundred forty-five".