866438542368 has 180 divisors, whose sum is σ = 2964200150142. Its totient is φ = 247553832960.

The previous prime is 866438542351. The next prime is 866438542373. The reversal of 866438542368 is 863245834668.

It is a happy number.

866438542368 is a `hidden beast` number, since 86 + 6 + 4 + 3 + 8 + 542 + 3 + 6 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 634526951184 + 231911591184 = 796572^2 + 481572^2 .

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 3283953 + ... + 3537968.

Almost surely, 2^866438542368 is an apocalyptic number.

It is an amenable number.

866438542368 is an abundant number, since it is smaller than the sum of its proper divisors (2097761607774).

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

866438542368 is a wasteful number, since it uses less digits than its factorization.

866438542368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6821957 (or 6821933 counting only the distinct ones).

The product of its digits is 159252480, while the sum is 63.

The spelling of 866438542368 in words is "eight hundred sixty-six billion, four hundred thirty-eight million, five hundred forty-two thousand, three hundred sixty-eight".