8661426066 has 80 divisors (see below), whose sum is σ = 20480169600. Its totient is φ = 2730480192.

The previous prime is 8661426061. The next prime is 8661426113. The reversal of 8661426066 is 6606241668.

8661426066 is a `hidden beast` number, since 8 + 6 + 614 + 26 + 0 + 6 + 6 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8661426061) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 318555 + ... + 344673.

It is an arithmetic number, because the mean of its divisors is an integer number (256002120).

Almost surely, 2^8661426066 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8661426066, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10240084800).

8661426066 is an abundant number, since it is smaller than the sum of its proper divisors (11818743534).

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

8661426066 is a wasteful number, since it uses less digits than its factorization.

8661426066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26245 (or 26236 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 8661426066 is about 93066.7828282465. The cubic root of 8661426066 is about 2053.6659421829.

The spelling of 8661426066 in words is "eight billion, six hundred sixty-one million, four hundred twenty-six thousand, sixty-six".