47181861864 has 96 divisors (see below), whose sum is σ = 132398323200. Its totient is φ = 15163182720.

The previous prime is 47181861851. The next prime is 47181861871. The reversal of 47181861864 is 46816818174.

47181861864 is a `hidden beast` number, since 4 + 7 + 1 + 8 + 18 + 618 + 6 + 4 = 666.

It is a super-2 number, since 2×47181861864² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 47181861864.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 561117 + ... + 639699.

It is an arithmetic number, because the mean of its divisors is an integer number (1379149200).

Almost surely, 2^47181861864 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 47181861864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66199161600).

47181861864 is an abundant number, since it is smaller than the sum of its proper divisors (85216461336).

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

47181861864 is a wasteful number, since it uses less digits than its factorization.

47181861864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78895 (or 78888 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The spelling of 47181861864 in words is "forty-seven billion, one hundred eighty-one million, eight hundred sixty-one thousand, eight hundred sixty-four".