73178318225 has 6 divisors (see below), whose sum is σ = 90741114630. Its totient is φ = 58542654560.

The previous prime is 73178318203. The next prime is 73178318233. The reversal of 73178318225 is 52281387137.

It can be written as a sum of positive squares in 3 ways, for example, as 10696316929 + 62482001296 = 103423^2 + 249964^2 .

It is not a de Polignac number, because 73178318225 - 2²² = 73174123921 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73178318225.

It is an unprimeable number.

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 in 5 ways as a sum of consecutive naturals, for example, 1463566340 + ... + 1463566389.

It is an arithmetic number, because the mean of its divisors is an integer number (15123519105).

Almost surely, 2^73178318225 is an apocalyptic number.

It is an amenable number.

73178318225 is a deficient number, since it is larger than the sum of its proper divisors (17562796405).

73178318225 is a wasteful number, since it uses less digits than its factorization.

73178318225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2927132739 (or 2927132734 counting only the distinct ones).

The product of its digits is 564480, while the sum is 47.

The spelling of 73178318225 in words is "seventy-three billion, one hundred seventy-eight million, three hundred eighteen thousand, two hundred twenty-five".