209518859972 has 12 divisors (see below), whose sum is σ = 371299246080. Its totient is φ = 103433361096.

The previous prime is 209518859947. The next prime is 209518860011. The reversal of 209518859972 is 279958815902.

It is a junction number, because it is equal to n+sod(n) for n = 209518859899 and 209518859908.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 331516868 + ... + 331517499.

It is an arithmetic number, because the mean of its divisors is an integer number (30941603840).

Almost surely, 2^209518859972 is an apocalyptic number.

It is an amenable number.

209518859972 is a deficient number, since it is larger than the sum of its proper divisors (161780386108).

209518859972 is a wasteful number, since it uses less digits than its factorization.

209518859972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663034450 (or 663034448 counting only the distinct ones).

The product of its (nonzero) digits is 32659200, while the sum is 65.

The spelling of 209518859972 in words is "two hundred nine billion, five hundred eighteen million, eight hundred fifty-nine thousand, nine hundred seventy-two".