159920809801 has 9 divisors (see below), whose sum is σ = 167185811821. Its totient is φ = 152958933292.

The previous prime is 159920809799. The next prime is 159920809817. The reversal of 159920809801 is 108908029951.

The square root of 159920809801 is 399901.

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

It is not a de Polignac number, because 159920809801 - 2¹ = 159920809799 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159920809501) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9189030 + ... + 9206416.

Almost surely, 2^159920809801 is an apocalyptic number.

159920809801 is the 399901-st square number.

159920809801 is the 199951-st centered octagonal number.

It is an amenable number.

159920809801 is a deficient number, since it is larger than the sum of its proper divisors (7265002020).

159920809801 is an frugal number, since it uses more digits than its factorization.

159920809801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34820 (or 17410 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 52.

The spelling of 159920809801 in words is "one hundred fifty-nine billion, nine hundred twenty million, eight hundred nine thousand, eight hundred one".