199697265625 has 99 divisors (see below), whose sum is σ = 297106927509. Its totient is φ = 134062500000.

The previous prime is 199697265623. The next prime is 199697265641. The reversal of 199697265625 is 526562796991.

The square root of 199697265625 is 446875.

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

It can be written as a sum of positive squares in 16 ways, for example, as 158624568729 + 41072696896 = 398277^2 + 202664^2 .

It is not a de Polignac number, because 199697265625 - 2¹ = 199697265623 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (199697265623) by changing a digit.

It is a polite number, since it can be written in 98 ways as a sum of consecutive naturals, for example, 15361328119 + ... + 15361328131.

Almost surely, 2^199697265625 is an apocalyptic number.

199697265625 is the 446875-th square number.

199697265625 is the 223438-th centered octagonal number.

It is an amenable number.

199697265625 is a deficient number, since it is larger than the sum of its proper divisors (97409661884).

199697265625 is an frugal number, since it uses more digits than its factorization.

199697265625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 29 counting only the distinct ones).

The product of its digits is 110224800, while the sum is 67.

The spelling of 199697265625 in words is "one hundred ninety-nine billion, six hundred ninety-seven million, two hundred sixty-five thousand, six hundred twenty-five".