20636098961 has 2 divisors, whose sum is σ = 20636098962. Its totient is φ = 20636098960.

The previous prime is 20636098933. The next prime is 20636098969. The reversal of 20636098961 is 16989063602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15775360000 + 4860738961 = 125600^2 + 69719^2 .

It is a cyclic number.

It is not a de Polignac number, because 20636098961 - 2³⁰ = 19562357137 is a prime.

It is not a weakly prime, because it can be changed into another prime (20636098969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10318049480 + 10318049481.

It is an arithmetic number, because the mean of its divisors is an integer number (10318049481).

Almost surely, 2^20636098961 is an apocalyptic number.

It is an amenable number.

20636098961 is a deficient number, since it is larger than the sum of its proper divisors (1).

20636098961 is an equidigital number, since it uses as much as digits as its factorization.

20636098961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 20636098961 in words is "twenty billion, six hundred thirty-six million, ninety-eight thousand, nine hundred sixty-one".