2158798411225 has 27 divisors (see below), whose sum is σ = 2772673908823. Its totient is φ = 1667321109440.

The previous prime is 2158798411223. The next prime is 2158798411241. The reversal of 2158798411225 is 5221148978512.

The square root of 2158798411225 is 1469285.

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 645494944329 + 1513303466896 = 803427^2 + 1230164^2 .

It is not a de Polignac number, because 2158798411225 - 2¹ = 2158798411223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2158798411223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 213041259 + ... + 213051391.

Almost surely, 2^{2158798411225} is an apocalyptic number.

2158798411225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2158798411225 is the 1469285-th square number.

2158798411225 is the 734643-rd centered octagonal number.

It is an amenable number.

2158798411225 is a deficient number, since it is larger than the sum of its proper divisors (613875497598).

2158798411225 is an frugal number, since it uses more digits than its factorization.

2158798411225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20334 (or 10167 counting only the distinct ones).

The product of its digits is 3225600, while the sum is 55.

The spelling of 2158798411225 in words is "two trillion, one hundred fifty-eight billion, seven hundred ninety-eight million, four hundred eleven thousand, two hundred twenty-five".