189699447025 has 27 divisors (see below), whose sum is σ = 258588297163. Its totient is φ = 137945812400.

The previous prime is 189699447023. The next prime is 189699447121. The reversal of 189699447025 is 520744996981.

The square root of 189699447025 is 435545.

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

It can be written as a sum of positive squares in only one way, i.e., 68291800929 + 121407646096 = 261327^2 + 348436^2 .

It is not a de Polignac number, because 189699447025 - 2¹ = 189699447023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189699447023) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 23951016 + ... + 23958934.

Almost surely, 2^189699447025 is an apocalyptic number.

189699447025 is the 435545-th square number.

189699447025 is the 217773-rd centered octagonal number.

It is an amenable number.

189699447025 is a deficient number, since it is larger than the sum of its proper divisors (68888850138).

189699447025 is an frugal number, since it uses more digits than its factorization.

189699447025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15870 (or 7935 counting only the distinct ones).

The product of its (nonzero) digits is 39191040, while the sum is 64.

Multiplying 189699447025 by its sum of digits (64), we get a square (12140764609600 = 3484360²).

The spelling of 189699447025 in words is "one hundred eighty-nine billion, six hundred ninety-nine million, four hundred forty-seven thousand, twenty-five".