198956142025 has 9 divisors (see below), whose sum is σ = 246708381621. Its totient is φ = 159163129440.

The previous prime is 198956142001. The next prime is 198956142053. The reversal of 198956142025 is 520241659891.

It is a happy number.

The square root of 198956142025 is 446045.

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 28152477369 + 170803664656 = 167787^2 + 413284^2 .

It is not a de Polignac number, because 198956142025 - 2¹⁵ = 198956109257 is a prime.

It is a super-2 number, since 2×198956142025² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2185621 + ... + 2274829.

Almost surely, 2^198956142025 is an apocalyptic number.

198956142025 is the 446045-th square number.

198956142025 is the 223023-rd centered octagonal number.

It is an amenable number.

198956142025 is a deficient number, since it is larger than the sum of its proper divisors (47752239596).

198956142025 is an frugal number, since it uses more digits than its factorization.

198956142025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178428 (or 89214 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 198956142025 in words is "one hundred ninety-eight billion, nine hundred fifty-six million, one hundred forty-two thousand, twenty-five".