216115642 has 4 divisors (see below), whose sum is σ = 324173466. Its totient is φ = 108057820.

The previous prime is 216115621. The next prime is 216115651. The reversal of 216115642 is 246511612.

216115642 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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., 187717401 + 28398241 = 13701^2 + 5329^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 216115642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54028909 + ... + 54028912.

Almost surely, 2^216115642 is an apocalyptic number.

216115642 is a deficient number, since it is larger than the sum of its proper divisors (108057824).

216115642 is a wasteful number, since it uses less digits than its factorization.

216115642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108057823.

The product of its digits is 2880, while the sum is 28.

The square root of 216115642 is about 14700.8721509984. The cubic root of 216115642 is about 600.1070568229.

The spelling of 216115642 in words is "two hundred sixteen million, one hundred fifteen thousand, six hundred forty-two".