861111080466 has 128 divisors (see below), whose sum is σ = 2232491950080. Its totient is φ = 215030515968.

The previous prime is 861111080411. The next prime is 861111080513. The reversal of 861111080466 is 664080111168.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18889036 + ... + 18934568.

It is an arithmetic number, because the mean of its divisors is an integer number (17441343360).

Almost surely, 2^861111080466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861111080466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1116245975040).

861111080466 is an abundant number, since it is smaller than the sum of its proper divisors (1371380869614).

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

861111080466 is a wasteful number, since it uses less digits than its factorization.

861111080466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47400.

The product of its (nonzero) digits is 55296, while the sum is 42.

The spelling of 861111080466 in words is "eight hundred sixty-one billion, one hundred eleven million, eighty thousand, four hundred sixty-six".