866511288468738 has 48 divisors (see below), whose sum is σ = 2048343681664800. Its totient is φ = 262550192331840.

The previous prime is 866511288468737. The next prime is 866511288468743. The reversal of 866511288468738 is 837864882115668.

866511288468738 is a `hidden beast` number, since 8 + 6 + 6 + 5 + 1 + 1 + 2 + 88 + 468 + 73 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (866511288468737) 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 23 ways as a sum of consecutive naturals, for example, 239751723 + ... + 243339086.

It is an arithmetic number, because the mean of its divisors is an integer number (42673826701350).

Almost surely, 2^{866511288468738} is an apocalyptic number.

866511288468738 is an abundant number, since it is smaller than the sum of its proper divisors (1181832393196062).

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

866511288468738 is a wasteful number, since it uses less digits than its factorization.

866511288468738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483099887 (or 483099884 counting only the distinct ones).

The product of its digits is 5945425920, while the sum is 81.

The spelling of 866511288468738 in words is "eight hundred sixty-six trillion, five hundred eleven billion, two hundred eighty-eight million, four hundred sixty-eight thousand, seven hundred thirty-eight".