866511272080026 has 64 divisors (see below), whose sum is σ = 1927151389180800. Its totient is φ = 288601491456000.

The previous prime is 866511272080021. The next prime is 866511272080039. The reversal of 866511272080026 is 620080272115668.

866511272080026 is a `hidden beast` number, since 8 + 6 + 6 + 511 + 2 + 7 + 20 + 80 + 0 + 26 = 666.

It is a super-2 number, since 2×866511272080026² (a number of 31 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (866511272080021) 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, 1784505360 + ... + 1784990868.

It is an arithmetic number, because the mean of its divisors is an integer number (30111740455950).

Almost surely, 2^{866511272080026} is an apocalyptic number.

866511272080026 is an abundant number, since it is smaller than the sum of its proper divisors (1060640117100774).

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

866511272080026 is a wasteful number, since it uses less digits than its factorization.

866511272080026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512412 (or 512406 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 54.

The spelling of 866511272080026 in words is "eight hundred sixty-six trillion, five hundred eleven billion, two hundred seventy-two million, eighty thousand, twenty-six".