20117621455277 has 2 divisors, whose sum is σ = 20117621455278. Its totient is φ = 20117621455276.

The previous prime is 20117621455247. The next prime is 20117621455291. The reversal of 20117621455277 is 77255412671102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11277816196516 + 8839805258761 = 3358246^2 + 2973181^2 .

It is a cyclic number.

It is not a de Polignac number, because 20117621455277 - 2⁶ = 20117621455213 is a prime.

It is a super-2 number, since 2×20117621455277² (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 (20117621455237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058810727638 + 10058810727639.

It is an arithmetic number, because the mean of its divisors is an integer number (10058810727639).

Almost surely, 2^{20117621455277} is an apocalyptic number.

It is an amenable number.

20117621455277 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117621455277 is an equidigital number, since it uses as much as digits as its factorization.

20117621455277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1646400, while the sum is 50.

The spelling of 20117621455277 in words is "twenty trillion, one hundred seventeen billion, six hundred twenty-one million, four hundred fifty-five thousand, two hundred seventy-seven".