725706655 has 8 divisors (see below), whose sum is σ = 871389792. Its totient is φ = 580204128.

The previous prime is 725706637. The next prime is 725706677. The reversal of 725706655 is 556607527.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 725706655 - 2¹⁵ = 725673887 is a prime.

It is a super-2 number, since 2×725706655² = 1053300298222578050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36147 + ... + 52516.

It is an arithmetic number, because the mean of its divisors is an integer number (108923724).

Almost surely, 2^725706655 is an apocalyptic number.

725706655 is a deficient number, since it is larger than the sum of its proper divisors (145683137).

725706655 is a wasteful number, since it uses less digits than its factorization.

725706655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90305.

The product of its (nonzero) digits is 441000, while the sum is 43.

The square root of 725706655 is about 26938.9430935959. The cubic root of 725706655 is about 898.6426679650.

The spelling of 725706655 in words is "seven hundred twenty-five million, seven hundred six thousand, six hundred fifty-five".