216217777277 has 8 divisors (see below), whose sum is σ = 229076350776. Its totient is φ = 203374746112.

The previous prime is 216217777271. The next prime is 216217777283. The reversal of 216217777277 is 772777712612.

It is an interprime number because it is at equal distance from previous prime (216217777271) and next prime (216217777283).

It can be written as a sum of positive squares in 4 ways, for example, as 11542064356 + 204675712921 = 107434^2 + 452411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 216217777277 - 2¹⁶ = 216217711741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216217777271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3856928 + ... + 3912585.

It is an arithmetic number, because the mean of its divisors is an integer number (28634543847).

Almost surely, 2^216217777277 is an apocalyptic number.

It is an amenable number.

216217777277 is a deficient number, since it is larger than the sum of its proper divisors (12858573499).

216217777277 is a wasteful number, since it uses less digits than its factorization.

216217777277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7771167.

The product of its digits is 5647152, while the sum is 56.

The spelling of 216217777277 in words is "two hundred sixteen billion, two hundred seventeen million, seven hundred seventy-seven thousand, two hundred seventy-seven".