209873147680 has 96 divisors (see below), whose sum is σ = 575115278976. Its totient is φ = 70882504704.

The previous prime is 209873147677. The next prime is 209873147681. The reversal of 209873147680 is 86741378902.

209873147680 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×209873147680² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209873147681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1323369 + ... + 1473448.

It is an arithmetic number, because the mean of its divisors is an integer number (5990784156).

Almost surely, 2^209873147680 is an apocalyptic number.

209873147680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209873147680 is an abundant number, since it is smaller than the sum of its proper divisors (365242131296).

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

209873147680 is a wasteful number, since it uses less digits than its factorization.

209873147680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2796906 (or 2796898 counting only the distinct ones).

The product of its (nonzero) digits is 4064256, while the sum is 55.

The spelling of 209873147680 in words is "two hundred nine billion, eight hundred seventy-three million, one hundred forty-seven thousand, six hundred eighty".