215816966 has 4 divisors (see below), whose sum is σ = 323725452. Its totient is φ = 107908482.

The previous prime is 215816959. The next prime is 215816969. The reversal of 215816966 is 669618512.

215816966 is digitally balanced in base 2, 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 is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215816969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53954240 + ... + 53954243.

It is an arithmetic number, because the mean of its divisors is an integer number (80931363).

Almost surely, 2^215816966 is an apocalyptic number.

215816966 is a deficient number, since it is larger than the sum of its proper divisors (107908486).

215816966 is a wasteful number, since it uses less digits than its factorization.

215816966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107908485.

The product of its digits is 155520, while the sum is 44.

The square root of 215816966 is about 14690.7101938606. The cubic root of 215816966 is about 599.8304761814.

The spelling of 215816966 in words is "two hundred fifteen million, eight hundred sixteen thousand, nine hundred sixty-six".