216678051 has 16 divisors (see below), whose sum is σ = 321261600. Its totient is φ = 144336384.

The previous prime is 216678047. The next prime is 216678079. The reversal of 216678051 is 150876612.

It is not a de Polignac number, because 216678051 - 2² = 216678047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 216677997 and 216678015.

It is not an unprimeable number, because it can be changed into a prime (216678041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43455 + ... + 48183.

It is an arithmetic number, because the mean of its divisors is an integer number (20078850).

Almost surely, 2^216678051 is an apocalyptic number.

216678051 is a deficient number, since it is larger than the sum of its proper divisors (104583549).

216678051 is a wasteful number, since it uses less digits than its factorization.

216678051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435 (or 6429 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 216678051 is about 14719.9881453757. The cubic root of 216678051 is about 600.6271692029.

The spelling of 216678051 in words is "two hundred sixteen million, six hundred seventy-eight thousand, fifty-one".