68181711545 has 8 divisors (see below), whose sum is σ = 81819700296. Its totient is φ = 54544271616.

The previous prime is 68181711539. The next prime is 68181711547. The reversal of 68181711545 is 54511718186.

It can be written as a sum of positive squares in 4 ways, for example, as 526060096 + 67655651449 = 22936^2 + 260107^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68181711545 - 2¹⁴ = 68181695161 is a prime.

It is a super-3 number, since 3×68181711545³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68181711545.

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 in 7 ways as a sum of consecutive naturals, for example, 221249 + ... + 430481.

It is an arithmetic number, because the mean of its divisors is an integer number (10227462537).

Almost surely, 2^68181711545 is an apocalyptic number.

It is an amenable number.

68181711545 is a deficient number, since it is larger than the sum of its proper divisors (13637988751).

68181711545 is a wasteful number, since it uses less digits than its factorization.

68181711545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274411.

The product of its digits is 268800, while the sum is 47.

The spelling of 68181711545 in words is "sixty-eight billion, one hundred eighty-one million, seven hundred eleven thousand, five hundred forty-five".