216172656306 has 40 divisors (see below), whose sum is σ = 484588164060. Its totient is φ = 72027608832.

The previous prime is 216172656263. The next prime is 216172656317. The reversal of 216172656306 is 603656271612.

216172656306 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 7 + 2 + 6 + 5 + 630 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 144487413225 + 71685243081 = 380115^2 + 267741^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 115510 + ... + 667598.

Almost surely, 2^216172656306 is an apocalyptic number.

216172656306 is an abundant number, since it is smaller than the sum of its proper divisors (268415507754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216172656306 is a wasteful number, since it uses less digits than its factorization.

216172656306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554520 (or 554511 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 216172656306 in words is "two hundred sixteen billion, one hundred seventy-two million, six hundred fifty-six thousand, three hundred six".