209673016416 has 72 divisors (see below), whose sum is σ = 631331634024. Its totient is φ = 65779768320.

The previous prime is 209673016409. The next prime is 209673016417. The reversal of 209673016416 is 614610376902.

It is a tau number, because it is divible by the number of its divisors (72).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209673016417) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21407790 + ... + 21417581.

It is an arithmetic number, because the mean of its divisors is an integer number (8768494917).

Almost surely, 2^209673016416 is an apocalyptic number.

It is an amenable number.

209673016416 is an abundant number, since it is smaller than the sum of its proper divisors (421658617608).

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

209673016416 is a wasteful number, since it uses less digits than its factorization.

209673016416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42825404 (or 42825393 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 209673016416 in words is "two hundred nine billion, six hundred seventy-three million, sixteen thousand, four hundred sixteen".