20682701689649 has 2 divisors, whose sum is σ = 20682701689650. Its totient is φ = 20682701689648.

The previous prime is 20682701689633. The next prime is 20682701689667. The reversal of 20682701689649 is 94698610728602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16683401659024 + 3999300030625 = 4084532^2 + 1999825^2 .

It is a cyclic number.

It is not a de Polignac number, because 20682701689649 - 2⁴ = 20682701689633 is a prime.

It is not a weakly prime, because it can be changed into another prime (20682701685649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10341350844824 + 10341350844825.

It is an arithmetic number, because the mean of its divisors is an integer number (10341350844825).

Almost surely, 2^{20682701689649} is an apocalyptic number.

It is an amenable number.

20682701689649 is a deficient number, since it is larger than the sum of its proper divisors (1).

20682701689649 is an equidigital number, since it uses as much as digits as its factorization.

20682701689649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 125411328, while the sum is 68.

The spelling of 20682701689649 in words is "twenty trillion, six hundred eighty-two billion, seven hundred one million, six hundred eighty-nine thousand, six hundred forty-nine".