20011011961 has 2 divisors, whose sum is σ = 20011011962. Its totient is φ = 20011011960.

The previous prime is 20011011949. The next prime is 20011012019. The reversal of 20011011961 is 16911011002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10374644736 + 9636367225 = 101856^2 + 98165^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011011961 - 2⁵ = 20011011929 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011011161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005505980 + 10005505981.

It is an arithmetic number, because the mean of its divisors is an integer number (10005505981).

Almost surely, 2^20011011961 is an apocalyptic number.

It is an amenable number.

20011011961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011011961 is an equidigital number, since it uses as much as digits as its factorization.

20011011961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 22.

Adding to 20011011961 its reverse (16911011002), we get a palindrome (36922022963).

The spelling of 20011011961 in words is "twenty billion, eleven million, eleven thousand, nine hundred sixty-one".