20003600161 has 4 divisors (see below), whose sum is σ = 20028327300. Its totient is φ = 19978873024.

The previous prime is 20003600119. The next prime is 20003600257. The reversal of 20003600161 is 16100630002.

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 7803072225 + 12200527936 = 88335^2 + 110456^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003600161 - 2¹¹ = 20003598113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20003604161) 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, 12362356 + ... + 12363973.

It is an arithmetic number, because the mean of its divisors is an integer number (5007081825).

Almost surely, 2^20003600161 is an apocalyptic number.

It is an amenable number.

20003600161 is a deficient number, since it is larger than the sum of its proper divisors (24727139).

20003600161 is an equidigital number, since it uses as much as digits as its factorization.

20003600161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24727138.

The product of its (nonzero) digits is 216, while the sum is 19.

The spelling of 20003600161 in words is "twenty billion, three million, six hundred thousand, one hundred sixty-one".