209796891272 has 16 divisors (see below), whose sum is σ = 394650508560. Its totient is φ = 104556755664.

The previous prime is 209796891259. The next prime is 209796891313. The reversal of 209796891272 is 272198697902.

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, 42708638 + ... + 42713549.

It is an arithmetic number, because the mean of its divisors is an integer number (24665656785).

Almost surely, 2^209796891272 is an apocalyptic number.

It is an amenable number.

209796891272 is a deficient number, since it is larger than the sum of its proper divisors (184853617288).

209796891272 is a wasteful number, since it uses less digits than its factorization.

209796891272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85422500 (or 85422496 counting only the distinct ones).

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 209796891272 in words is "two hundred nine billion, seven hundred ninety-six million, eight hundred ninety-one thousand, two hundred seventy-two".