861582145392 has 120 divisors (see below), whose sum is σ = 2491437922688. Its totient is φ = 277659187200.

The previous prime is 861582145337. The next prime is 861582145421. The reversal of 861582145392 is 293541285168.

861582145392 is a `hidden beast` number, since 8 + 6 + 1 + 582 + 1 + 4 + 53 + 9 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4517892 + ... + 4704732.

Almost surely, 2^861582145392 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 861582145392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1245718961344).

861582145392 is an abundant number, since it is smaller than the sum of its proper divisors (1629855777296).

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

861582145392 is a wasteful number, since it uses less digits than its factorization.

861582145392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187919 (or 187910 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 861582145392 in words is "eight hundred sixty-one billion, five hundred eighty-two million, one hundred forty-five thousand, three hundred ninety-two".