199670454025 has 81 divisors (see below), whose sum is σ = 306360995157. Its totient is φ = 128691360000.

The previous prime is 199670454023. The next prime is 199670454029. The reversal of 199670454025 is 520454076991.

The square root of 199670454025 is 446845.

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 4670492281 + 194999961744 = 68341^2 + 441588^2 .

It is not a de Polignac number, because 199670454025 - 2¹ = 199670454023 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199670454023) 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, 265872400 + ... + 265873150.

Almost surely, 2^199670454025 is an apocalyptic number.

199670454025 is the 446845-th square number.

199670454025 is the 223423-rd centered octagonal number.

It is an amenable number.

199670454025 is a deficient number, since it is larger than the sum of its proper divisors (106690541132).

199670454025 is an frugal number, since it uses more digits than its factorization.

199670454025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1560 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 52.

The spelling of 199670454025 in words is "one hundred ninety-nine billion, six hundred seventy million, four hundred fifty-four thousand, twenty-five".