8561340431658 has 128 divisors (see below), whose sum is σ = 22459823562240. Its totient is φ = 2366228712960.

The previous prime is 8561340431629. The next prime is 8561340431669.

It is a happy number.

8561340431658 is a `hidden beast` number, since 8 + 5 + 613 + 4 + 0 + 4 + 3 + 16 + 5 + 8 = 666.

8561340431658 is nontrivially palindromic in base 10.

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

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, 650398 + ... + 4188758.

It is an arithmetic number, because the mean of its divisors is an integer number (175467371580).

Almost surely, 2^{8561340431658} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8561340431658, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11229911781120).

8561340431658 is an abundant number, since it is smaller than the sum of its proper divisors (13898483130582).

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

8561340431658 is a wasteful number, since it uses less digits than its factorization.

8561340431658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3538589 (or 3538583 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

It can be divided in two parts, 8561340 and 431658, that added together give a palindrome (8992998).

The spelling of 8561340431658 in words is "eight trillion, five hundred sixty-one billion, three hundred forty million, four hundred thirty-one thousand, six hundred fifty-eight".