866123855616810 has 64 divisors (see below), whose sum is σ = 2375656517044224. Its totient is φ = 197970957576000.

The previous prime is 866123855616791. The next prime is 866123855616931. The reversal of 866123855616810 is 18616558321668.

It is a super-2 number, since 2×866123855616810² (a number of 31 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 289350705 + ... + 292328715.

It is an arithmetic number, because the mean of its divisors is an integer number (37119633078816).

Almost surely, 2^{866123855616810} is an apocalyptic number.

866123855616810 is an abundant number, since it is smaller than the sum of its proper divisors (1509532661427414).

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

866123855616810 is a wasteful number, since it uses less digits than its factorization.

866123855616810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4362979.

The product of its (nonzero) digits is 99532800, while the sum is 66.

The spelling of 866123855616810 in words is "eight hundred sixty-six trillion, one hundred twenty-three billion, eight hundred fifty-five million, six hundred sixteen thousand, eight hundred ten".