216161378 has 4 divisors (see below), whose sum is σ = 324242070. Its totient is φ = 108080688.

The previous prime is 216161377. The next prime is 216161411. The reversal of 216161378 is 873161612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 114211969 + 101949409 = 10687^2 + 10097^2 .

It is not an unprimeable number, because it can be changed into a 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, 54040343 + ... + 54040346.

Almost surely, 2^216161378 is an apocalyptic number.

216161378 is a deficient number, since it is larger than the sum of its proper divisors (108080692).

216161378 is a wasteful number, since it uses less digits than its factorization.

216161378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108080691.

The product of its digits is 12096, while the sum is 35.

The square root of 216161378 is about 14702.4276226751. The cubic root of 216161378 is about 600.1493868769.

The spelling of 216161378 in words is "two hundred sixteen million, one hundred sixty-one thousand, three hundred seventy-eight".