209117136672 has 96 divisors (see below), whose sum is σ = 642026347200. Its totient is φ = 66036985344.

The previous prime is 209117136667. The next prime is 209117136713. The reversal of 209117136672 is 276631711902.

209117136672 is a `hidden beast` number, since 209 + 1 + 17 + 1 + 366 + 72 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6352893 + ... + 6385724.

It is an arithmetic number, because the mean of its divisors is an integer number (6687774450).

Almost surely, 2^209117136672 is an apocalyptic number.

It is an amenable number.

209117136672 is an abundant number, since it is smaller than the sum of its proper divisors (432909210528).

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

209117136672 is a wasteful number, since it uses less digits than its factorization.

209117136672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12738655 (or 12738641 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The spelling of 209117136672 in words is "two hundred nine billion, one hundred seventeen million, one hundred thirty-six thousand, six hundred seventy-two".