861208091136 has 200 divisors, whose sum is σ = 2576088613824. Its totient is φ = 286442956800.

The previous prime is 861208091123. The next prime is 861208091171. The reversal of 861208091136 is 631190802168.

It is a super-2 number, since 2×861208091136² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 861208091091 and 861208091100.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19179111 + ... + 19223961.

Almost surely, 2^861208091136 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 861208091136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288044306912).

861208091136 is an abundant number, since it is smaller than the sum of its proper divisors (1714880522688).

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

861208091136 is an equidigital number, since it uses as much as digits as its factorization.

861208091136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45344 (or 45319 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 861208091136 in words is "eight hundred sixty-one billion, two hundred eight million, ninety-one thousand, one hundred thirty-six".