7884218173225 has 27 divisors (see below), whose sum is σ = 10021427553391. Its totient is φ = 6153086873600.

The previous prime is 7884218173219. The next prime is 7884218173277. The reversal of 7884218173225 is 5223718124887.

The square root of 7884218173225 is 2807885.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 13 ways, for example, as 5739153296409 + 2145064876816 = 2395653^2 + 1464604^2 .

It is not a de Polignac number, because 7884218173225 - 2¹⁵ = 7884218140457 is a prime.

It is a super-2 number, since 2×7884218173225² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7884218173225.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 575609577 + ... + 575623273.

Almost surely, 2^{7884218173225} is an apocalyptic number.

7884218173225 is the 2807885-th square number.

7884218173225 is the 1403943-rd centered octagonal number.

It is an amenable number.

7884218173225 is a deficient number, since it is larger than the sum of its proper divisors (2137209380166).

7884218173225 is an frugal number, since it uses more digits than its factorization.

7884218173225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27486 (or 13743 counting only the distinct ones).

The product of its digits is 12042240, while the sum is 58.

The spelling of 7884218173225 in words is "seven trillion, eight hundred eighty-four billion, two hundred eighteen million, one hundred seventy-three thousand, two hundred twenty-five".