216161377 has 2 divisors, whose sum is σ = 216161378.
Its totient is φ = 216161376.
The previous prime is 216161371. The next prime is 216161411. The reversal of 216161377 is 773161612.
It is an a-pointer prime, because the next prime (216161411) can be obtained adding 216161377 to its sum of digits (34).
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 213189201 + 2972176 = 14601^2 + 1724^2
It is a cyclic number.
It is not a de Polignac number, because 216161377 - 211 = 216159329 is a prime.
It is a super-2 number, since 2×2161613772 = 93451481813072258, which contains 22 as substring.
It is not a weakly prime, because it can be changed into another prime (216161371) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108080688 + 108080689.
It is an arithmetic number, because the mean of its divisors is an integer number (108080689).
Almost surely, 2216161377 is an apocalyptic number.
It is an amenable number.
216161377 is a deficient number, since it is larger than the sum of its proper divisors (1).
216161377 is an equidigital number, since it uses as much as digits as its factorization.
216161377 is an odious number, because the sum of its binary digits is odd.
The product of its digits is 10584, while the sum is 34.
The square root of 216161377 is about 14702.4275886671.
The cubic root of 216161377 is about 600.1493859515.
The spelling of 216161377 in words is "two hundred sixteen million, one hundred sixty-one thousand, three hundred seventy-seven".