20011197907717 has 2 divisors, whose sum is σ = 20011197907718. Its totient is φ = 20011197907716.

The previous prime is 20011197907693. The next prime is 20011197907763. The reversal of 20011197907717 is 71770979111002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14260789111716 + 5750408796001 = 3776346^2 + 2398001^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011197907717 - 2¹⁵ = 20011197874949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20011197907777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005598953858 + 10005598953859.

It is an arithmetic number, because the mean of its divisors is an integer number (10005598953859).

Almost surely, 2^{20011197907717} is an apocalyptic number.

It is an amenable number.

20011197907717 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011197907717 is an equidigital number, since it uses as much as digits as its factorization.

20011197907717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 388962, while the sum is 52.

The spelling of 20011197907717 in words is "twenty trillion, eleven billion, one hundred ninety-seven million, nine hundred seven thousand, seven hundred seventeen".