20001641171 has 2 divisors, whose sum is σ = 20001641172. Its totient is φ = 20001641170.

The previous prime is 20001641147. The next prime is 20001641251. The reversal of 20001641171 is 17114610002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001641171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001641141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000820585 + 10000820586.

It is an arithmetic number, because the mean of its divisors is an integer number (10000820586).

Almost surely, 2^20001641171 is an apocalyptic number.

20001641171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001641171 is an equidigital number, since it uses as much as digits as its factorization.

20001641171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 23.

The spelling of 20001641171 in words is "twenty billion, one million, six hundred forty-one thousand, one hundred seventy-one".