866763548305656 has 32 divisors (see below), whose sum is σ = 2166918750614400. Its totient is φ = 288919865455200.

The previous prime is 866763548305621. The next prime is 866763548305703. The reversal of 866763548305656 is 656503845367668.

It is a super-2 number, since 2×866763548305656² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76951420 + ... + 87493131.

It is an arithmetic number, because the mean of its divisors is an integer number (67716210956700).

Almost surely, 2^{866763548305656} is an apocalyptic number.

It is an amenable number.

866763548305656 is an abundant number, since it is smaller than the sum of its proper divisors (1300155202308744).

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

866763548305656 is a wasteful number, since it uses less digits than its factorization.

866763548305656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164664179 (or 164664175 counting only the distinct ones).

The product of its (nonzero) digits is 15676416000, while the sum is 78.

The spelling of 866763548305656 in words is "eight hundred sixty-six trillion, seven hundred sixty-three billion, five hundred forty-eight million, three hundred five thousand, six hundred fifty-six".