161800235536 has 45 divisors (see below), whose sum is σ = 315587427631. Its totient is φ = 80361915296.

The previous prime is 161800235491. The next prime is 161800235537. The reversal of 161800235536 is 635532008161.

The square root of 161800235536 is 402244.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161800235537) 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, 365237331 + ... + 365237773.

Almost surely, 2^161800235536 is an apocalyptic number.

161800235536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

161800235536 is the 402244-th square number.

It is an amenable number.

161800235536 is a deficient number, since it is larger than the sum of its proper divisors (153787192095).

161800235536 is an frugal number, since it uses more digits than its factorization.

161800235536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1348 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 40.

The spelling of 161800235536 in words is "one hundred sixty-one billion, eight hundred million, two hundred thirty-five thousand, five hundred thirty-six".