16505220117277 has 2 divisors, whose sum is σ = 16505220117278. Its totient is φ = 16505220117276.

The previous prime is 16505220117271. The next prime is 16505220117319. The reversal of 16505220117277 is 77271102250561.

16505220117277 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16468833028761 + 36387088516 = 4058181^2 + 190754^2 .

It is a cyclic number.

It is not a de Polignac number, because 16505220117277 - 2²³ = 16505211728669 is a prime.

It is a super-2 number, since 2×16505220117277² (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 (16505220117271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8252610058638 + 8252610058639.

It is an arithmetic number, because the mean of its divisors is an integer number (8252610058639).

Almost surely, 2^{16505220117277} is an apocalyptic number.

It is an amenable number.

16505220117277 is a deficient number, since it is larger than the sum of its proper divisors (1).

16505220117277 is an equidigital number, since it uses as much as digits as its factorization.

16505220117277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 411600, while the sum is 46.

The spelling of 16505220117277 in words is "sixteen trillion, five hundred five billion, two hundred twenty million, one hundred seventeen thousand, two hundred seventy-seven".