209144831968 has 24 divisors (see below), whose sum is σ = 411846552432. Its totient is φ = 104548882176.

The previous prime is 209144831963. The next prime is 209144831971. The reversal of 209144831968 is 869138441902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209144831963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 590580 + ... + 875827.

It is an arithmetic number, because the mean of its divisors is an integer number (17160273018).

Almost surely, 2^209144831968 is an apocalyptic number.

It is an amenable number.

209144831968 is a deficient number, since it is larger than the sum of its proper divisors (202701720464).

209144831968 is a wasteful number, since it uses less digits than its factorization.

209144831968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1470874 (or 1470866 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 55.

The spelling of 209144831968 in words is "two hundred nine billion, one hundred forty-four million, eight hundred thirty-one thousand, nine hundred sixty-eight".