216205424761 has 4 divisors (see below), whose sum is σ = 220284772452. Its totient is φ = 212126077072.

The previous prime is 216205424753. The next prime is 216205424789. The reversal of 216205424761 is 167424502612.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 118349072361 + 97856352400 = 344019^2 + 312820^2 .

It is a cyclic number.

It is not a de Polignac number, because 216205424761 - 2³ = 216205424753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216205424161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2039673766 + ... + 2039673871.

It is an arithmetic number, because the mean of its divisors is an integer number (55071193113).

Almost surely, 2^216205424761 is an apocalyptic number.

It is an amenable number.

216205424761 is a deficient number, since it is larger than the sum of its proper divisors (4079347691).

216205424761 is an equidigital number, since it uses as much as digits as its factorization.

216205424761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4079347690.

The product of its (nonzero) digits is 161280, while the sum is 40.

The spelling of 216205424761 in words is "two hundred sixteen billion, two hundred five million, four hundred twenty-four thousand, seven hundred sixty-one".