866123876771472 has 160 divisors (see below), whose sum is σ = 2506983457075200. Its totient is φ = 255356120194560.

The previous prime is 866123876771471. The next prime is 866123876771477. The reversal of 866123876771472 is 274177678321668.

It is a super-2 number, since 2×866123876771472² (a number of 31 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 866123876771394 and 866123876771403.

It is not an unprimeable number, because it can be changed into a prime (866123876771471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 415526529 + ... + 417605727.

It is an arithmetic number, because the mean of its divisors is an integer number (15668646606720).

Almost surely, 2^{866123876771472} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 866123876771472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1253491728537600).

866123876771472 is an abundant number, since it is smaller than the sum of its proper divisors (1640859580303728).

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

866123876771472 is a wasteful number, since it uses less digits than its factorization.

866123876771472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100581 (or 2100575 counting only the distinct ones).

The product of its digits is 1593188352, while the sum is 75.

The spelling of 866123876771472 in words is "eight hundred sixty-six trillion, one hundred twenty-three billion, eight hundred seventy-six million, seven hundred seventy-one thousand, four hundred seventy-two".