725559155 has 4 divisors (see below), whose sum is σ = 870670992. Its totient is φ = 580447320.

The previous prime is 725559143. The next prime is 725559157. The reversal of 725559155 is 551955527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 551955527 = 31 ⋅17805017.

It is not a de Polignac number, because 725559155 - 2⁴ = 725559139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725559157) 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, 72555911 + ... + 72555920.

It is an arithmetic number, because the mean of its divisors is an integer number (217667748).

Almost surely, 2^725559155 is an apocalyptic number.

725559155 is a deficient number, since it is larger than the sum of its proper divisors (145111837).

725559155 is a wasteful number, since it uses less digits than its factorization.

725559155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145111836.

The product of its digits is 393750, while the sum is 44.

The square root of 725559155 is about 26936.2052821105. The cubic root of 725559155 is about 898.5817807485.

The spelling of 725559155 in words is "seven hundred twenty-five million, five hundred fifty-nine thousand, one hundred fifty-five".