20996866601 has 2 divisors, whose sum is σ = 20996866602. Its totient is φ = 20996866600.

The previous prime is 20996866591. The next prime is 20996866609. The reversal of 20996866601 is 10666869902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20981812201 + 15054400 = 144851^2 + 3880^2 .

It is a cyclic number.

It is not a de Polignac number, because 20996866601 - 2³⁰ = 19923124777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (20996866609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10498433300 + 10498433301.

It is an arithmetic number, because the mean of its divisors is an integer number (10498433301).

Almost surely, 2^20996866601 is an apocalyptic number.

It is an amenable number.

20996866601 is a deficient number, since it is larger than the sum of its proper divisors (1).

20996866601 is an equidigital number, since it uses as much as digits as its factorization.

20996866601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The spelling of 20996866601 in words is "twenty billion, nine hundred ninety-six million, eight hundred sixty-six thousand, six hundred one".