196687815025 has 27 divisors (see below), whose sum is σ = 264135747969. Its totient is φ = 145225098720.

The previous prime is 196687814993. The next prime is 196687815061. The reversal of 196687815025 is 520518786691.

It is a happy number.

The square root of 196687815025 is 443495.

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

196687815025 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 50696575281 + 145991239744 = 225159^2 + 382088^2 .

It is not a de Polignac number, because 196687815025 - 2⁵ = 196687814993 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, 28823764 + ... + 28830586.

Almost surely, 2^196687815025 is an apocalyptic number.

196687815025 is the 443495-th square number.

196687815025 is the 221748-th centered octagonal number.

It is an amenable number.

196687815025 is a deficient number, since it is larger than the sum of its proper divisors (67447932944).

196687815025 is an frugal number, since it uses more digits than its factorization.

196687815025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13682 (or 6841 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 58.

The spelling of 196687815025 in words is "one hundred ninety-six billion, six hundred eighty-seven million, eight hundred fifteen thousand, twenty-five".