68181711544 has 8 divisors (see below), whose sum is σ = 127840709160. Its totient is φ = 34090855768.

The previous prime is 68181711539. The next prime is 68181711547. The reversal of 68181711544 is 44511718186.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×68181711544³ (a number of 33 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 68181711494 and 68181711503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68181711547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4261356964 + ... + 4261356979.

It is an arithmetic number, because the mean of its divisors is an integer number (15980088645).

Almost surely, 2^68181711544 is an apocalyptic number.

It is an amenable number.

68181711544 is a deficient number, since it is larger than the sum of its proper divisors (59658997616).

68181711544 is a wasteful number, since it uses less digits than its factorization.

68181711544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8522713949 (or 8522713945 counting only the distinct ones).

The product of its digits is 215040, while the sum is 46.

The spelling of 68181711544 in words is "sixty-eight billion, one hundred eighty-one million, seven hundred eleven thousand, five hundred forty-four".