20551756685107 has 2 divisors, whose sum is σ = 20551756685108. Its totient is φ = 20551756685106.

The previous prime is 20551756684993. The next prime is 20551756685137. The reversal of 20551756685107 is 70158665715502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20551756685107 - 2³⁹ = 20002000871219 is a prime.

It is not a weakly prime, because it can be changed into another prime (20551756685137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10275878342553 + 10275878342554.

It is an arithmetic number, because the mean of its divisors is an integer number (10275878342554).

Almost surely, 2^{20551756685107} is an apocalyptic number.

20551756685107 is a deficient number, since it is larger than the sum of its proper divisors (1).

20551756685107 is an equidigital number, since it uses as much as digits as its factorization.

20551756685107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17640000, while the sum is 58.

The spelling of 20551756685107 in words is "twenty trillion, five hundred fifty-one billion, seven hundred fifty-six million, six hundred eighty-five thousand, one hundred seven".