20002000261 has 2 divisors, whose sum is σ = 20002000262. Its totient is φ = 20002000260.

The previous prime is 20002000253. The next prime is 20002000273. The reversal of 20002000261 is 16200020002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16159240161 + 3842760100 = 127119^2 + 61990^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002000261 - 2³ = 20002000253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20002000661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001000130 + 10001000131.

It is an arithmetic number, because the mean of its divisors is an integer number (10001000131).

Almost surely, 2^20002000261 is an apocalyptic number.

It is an amenable number.

20002000261 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002000261 is an equidigital number, since it uses as much as digits as its factorization.

20002000261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20002000261 its reverse (16200020002), we get a palindrome (36202020263).

The spelling of 20002000261 in words is "twenty billion, two million, two hundred sixty-one", and thus it is an aban number.