209679783144976 has 45 divisors (see below), whose sum is σ = 415087592264751. Its totient is φ = 102607923391776.

The previous prime is 209679783144863. The next prime is 209679783144991. The reversal of 209679783144976 is 679441387976902.

The square root of 209679783144976 is 14480324.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×209679783144976² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209679783144976.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2722262401 + ... + 2722339423.

Almost surely, 2^{209679783144976} is an apocalyptic number.

209679783144976 is the 14480324-th square number.

It is an amenable number.

209679783144976 is a deficient number, since it is larger than the sum of its proper divisors (205407809119775).

209679783144976 is an frugal number, since it uses more digits than its factorization.

209679783144976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154148 (or 77072 counting only the distinct ones).

The product of its (nonzero) digits is 6913299456, while the sum is 82.

The spelling of 209679783144976 in words is "two hundred nine trillion, six hundred seventy-nine billion, seven hundred eighty-three million, one hundred forty-four thousand, nine hundred seventy-six".