159964002025 has 27 divisors (see below), whose sum is σ = 203415558789. Its totient is φ = 124785960000.

The previous prime is 159964001971. The next prime is 159964002047. The reversal of 159964002025 is 520200469951.

The square root of 159964002025 is 399955.

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 67331427289 + 92632574736 = 259483^2 + 304356^2 .

It is not a de Polignac number, because 159964002025 - 2²¹ = 159961904873 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 81989800 + ... + 81991750.

Almost surely, 2^159964002025 is an apocalyptic number.

159964002025 is the 399955-th square number.

159964002025 is the 199978-th centered octagonal number.

It is an amenable number.

159964002025 is a deficient number, since it is larger than the sum of its proper divisors (43451556764).

159964002025 is an frugal number, since it uses more digits than its factorization.

159964002025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3994 (or 1997 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 159964002025 in words is "one hundred fifty-nine billion, nine hundred sixty-four million, two thousand, twenty-five".