216157706 has 16 divisors (see below), whose sum is σ = 336234240. Its totient is φ = 104097840.

The previous prime is 216157693. The next prime is 216157717. The reversal of 216157706 is 607751612.

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, 20675 + ... + 29321.

It is an arithmetic number, because the mean of its divisors is an integer number (21014640).

Almost surely, 2^216157706 is an apocalyptic number.

216157706 is a deficient number, since it is larger than the sum of its proper divisors (120076534).

216157706 is a wasteful number, since it uses less digits than its factorization.

216157706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9109.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 216157706 is about 14702.3027448084. The cubic root of 216157706 is about 600.1459885501.

The spelling of 216157706 in words is "two hundred sixteen million, one hundred fifty-seven thousand, seven hundred six".