216856155 has 8 divisors (see below), whose sum is σ = 346969872. Its totient is φ = 115656608.

The previous prime is 216856147. The next prime is 216856169. The reversal of 216856155 is 551658612.

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 216856155 - 2³ = 216856147 is a prime.

It is a super-2 number, since 2×216856155² = 94053183922768050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7228524 + ... + 7228553.

It is an arithmetic number, because the mean of its divisors is an integer number (43371234).

Almost surely, 2^216856155 is an apocalyptic number.

216856155 is a deficient number, since it is larger than the sum of its proper divisors (130113717).

216856155 is a wasteful number, since it uses less digits than its factorization.

216856155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14457085.

The product of its digits is 72000, while the sum is 39.

The square root of 216856155 is about 14726.0366358365. The cubic root of 216856155 is about 600.7916910272.

The spelling of 216856155 in words is "two hundred sixteen million, eight hundred fifty-six thousand, one hundred fifty-five".