9988855065225 has 81 divisors (see below), whose sum is σ = 18283989769383. Its totient is φ = 5212877588640.

The previous prime is 9988855065197. The next prime is 9988855065253. The reversal of 9988855065225 is 5225605588899.

The square root of 9988855065225 is 3160515.

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

9988855065225 is a `hidden beast` number, since 9 + 9 + 8 + 8 + 8 + 550 + 65 + 2 + 2 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (9988855065197) and next prime (9988855065253).

It can be written as a sum of positive squares in only one way, i.e., 3595987823481 + 6392867241744 = 1896309^2 + 2528412^2 .

It is not a de Polignac number, because 9988855065225 - 2²⁹ = 9988318194313 is a prime.

It is a super-2 number, since 2×9988855065225² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 80 ways as a sum of consecutive naturals, for example, 2228160834 + ... + 2228165316.

Almost surely, 2^{9988855065225} is an apocalyptic number.

9988855065225 is the 3160515-th square number.

9988855065225 is the 1580258-th centered octagonal number.

It is an amenable number.

9988855065225 is a deficient number, since it is larger than the sum of its proper divisors (8295134704158).

9988855065225 is an frugal number, since it uses more digits than its factorization.

9988855065225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9076 (or 4538 counting only the distinct ones).

The product of its (nonzero) digits is 622080000, while the sum is 72.

The spelling of 9988855065225 in words is "nine trillion, nine hundred eighty-eight billion, eight hundred fifty-five million, sixty-five thousand, two hundred twenty-five".