159644198025 has 135 divisors (see below), whose sum is σ = 320682963909. Its totient is φ = 78478994880.

The previous prime is 159644198017. The next prime is 159644198041. The reversal of 159644198025 is 520891446951.

The square root of 159644198025 is 399555.

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

159644198025 is a `hidden beast` number, since 1 + 5 + 96 + 441 + 98 + 0 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 41148528201 + 118495669824 = 202851^2 + 344232^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is not a de Polignac number, because 159644198025 - 2³ = 159644198017 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 233739334 + ... + 233740016.

Almost surely, 2^159644198025 is an apocalyptic number.

159644198025 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

159644198025 is the 399555-th square number.

159644198025 is the 199778-th centered octagonal number.

It is an amenable number.

159644198025 is an abundant number, since it is smaller than the sum of its proper divisors (161038765884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

159644198025 is an frugal number, since it uses more digits than its factorization.

159644198025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414 (or 704 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The spelling of 159644198025 in words is "one hundred fifty-nine billion, six hundred forty-four million, one hundred ninety-eight thousand, twenty-five".