861181966233342 has 96 divisors (see below), whose sum is σ = 2074359443310336. Its totient is φ = 256417173849600.

The previous prime is 861181966233317. The next prime is 861181966233361. The reversal of 861181966233342 is 243332669181168.

861181966233342 is a `hidden beast` number, since 8 + 6 + 1 + 18 + 196 + 62 + 33 + 342 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 861181966233342.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 128263242 + ... + 134810322.

It is an arithmetic number, because the mean of its divisors is an integer number (21607910867816).

Almost surely, 2^{861181966233342} is an apocalyptic number.

861181966233342 is an abundant number, since it is smaller than the sum of its proper divisors (1213177477076994).

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

861181966233342 is a wasteful number, since it uses less digits than its factorization.

861181966233342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6565266 (or 6565263 counting only the distinct ones).

The product of its digits is 53747712, while the sum is 63.

The spelling of 861181966233342 in words is "eight hundred sixty-one trillion, one hundred eighty-one billion, nine hundred sixty-six million, two hundred thirty-three thousand, three hundred forty-two".