861595381080 has 512 divisors, whose sum is σ = 3658265856000. Its totient is φ = 175595765760.

The previous prime is 861595381057. The next prime is 861595381081. The reversal of 861595381080 is 80183595168.

861595381080 is a `hidden beast` number, since 8 + 6 + 1 + 595 + 38 + 10 + 8 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861595381081) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2265460 + ... + 2618300.

It is an arithmetic number, because the mean of its divisors is an integer number (7145050500).

Almost surely, 2^861595381080 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 861595381080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1829132928000).

861595381080 is an abundant number, since it is smaller than the sum of its proper divisors (2796670474920).

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

861595381080 is a wasteful number, since it uses less digits than its factorization.

861595381080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352904 (or 352894 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The spelling of 861595381080 in words is "eight hundred sixty-one billion, five hundred ninety-five million, three hundred eighty-one thousand, eighty".