9951595798225 has 27 divisors (see below), whose sum is σ = 12546802903089. Its totient is φ = 7830006799200.

The previous prime is 9951595798181. The next prime is 9951595798241. The reversal of 9951595798225 is 5228975951599.

The square root of 9951595798225 is 3154615.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4583885282001 + 5367710516224 = 2141001^2 + 2316832^2 .

It is not a de Polignac number, because 9951595798225 - 2⁹ = 9951595797713 is a prime.

It is a Duffinian 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 26 ways as a sum of consecutive naturals, for example, 962152404 + ... + 962162746.

Almost surely, 2^{9951595798225} is an apocalyptic number.

9951595798225 is the 3154615-th square number.

9951595798225 is the 1577308-th centered octagonal number.

It is an amenable number.

9951595798225 is a deficient number, since it is larger than the sum of its proper divisors (2595207104864).

9951595798225 is an frugal number, since it uses more digits than its factorization.

9951595798225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20818 (or 10409 counting only the distinct ones).

The product of its digits is 918540000, while the sum is 76.

The spelling of 9951595798225 in words is "nine trillion, nine hundred fifty-one billion, five hundred ninety-five million, seven hundred ninety-eight thousand, two hundred twenty-five".