20004264661 has 2 divisors, whose sum is σ = 20004264662. Its totient is φ = 20004264660.

The previous prime is 20004264659. The next prime is 20004264673. The reversal of 20004264661 is 16646240002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10038036100 + 9966228561 = 100190^2 + 99831^2 .

It is a cyclic number.

It is not a de Polignac number, because 20004264661 - 2¹ = 20004264659 is a prime.

Together with 20004264659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20004264961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10002132330 + 10002132331.

It is an arithmetic number, because the mean of its divisors is an integer number (10002132331).

Almost surely, 2^20004264661 is an apocalyptic number.

It is an amenable number.

20004264661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20004264661 is an equidigital number, since it uses as much as digits as its factorization.

20004264661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13824, while the sum is 31.

The spelling of 20004264661 in words is "twenty billion, four million, two hundred sixty-four thousand, six hundred sixty-one".