158838117025 has 81 divisors (see below), whose sum is σ = 234278866521. Its totient is φ = 106516730880.

The previous prime is 158838116939. The next prime is 158838117029. The reversal of 158838117025 is 520711838851.

The square root of 158838117025 is 398545.

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 25545948561 + 133292168464 = 159831^2 + 365092^2 .

It is not a de Polignac number, because 158838117025 - 2¹³ = 158838108833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 158838117025.

It is not an unprimeable number, because it can be changed into a prime (158838117029) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 822995329 + ... + 822995521.

Almost surely, 2^158838117025 is an apocalyptic number.

158838117025 is the 398545-th square number.

158838117025 is the 199273-rd centered octagonal number.

It is an amenable number.

158838117025 is a deficient number, since it is larger than the sum of its proper divisors (75440749496).

158838117025 is an frugal number, since it uses more digits than its factorization.

158838117025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 528 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 49.

Multiplying 158838117025 by its sum of digits (49), we get a square (7783067734225 = 2789815²).

158838117025 divided by its sum of digits (49) gives a square (3241594225 = 56935²).

The spelling of 158838117025 in words is "one hundred fifty-eight billion, eight hundred thirty-eight million, one hundred seventeen thousand, twenty-five".