20117556164773 has 2 divisors, whose sum is σ = 20117556164774. Its totient is φ = 20117556164772.

The previous prime is 20117556164659. The next prime is 20117556164779. The reversal of 20117556164773 is 37746165571102.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20117216389284 + 339775489 = 4485222^2 + 18433^2 .

It is a cyclic number.

It is not a de Polignac number, because 20117556164773 - 2²¹ = 20117554067621 is a prime.

It is a super-2 number, since 2×20117556164773² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20117556164779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058778082386 + 10058778082387.

It is an arithmetic number, because the mean of its divisors is an integer number (10058778082387).

Almost surely, 2^{20117556164773} is an apocalyptic number.

It is an amenable number.

20117556164773 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117556164773 is an equidigital number, since it uses as much as digits as its factorization.

20117556164773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7408800, while the sum is 55.

The spelling of 20117556164773 in words is "twenty trillion, one hundred seventeen billion, five hundred fifty-six million, one hundred sixty-four thousand, seven hundred seventy-three".