181968651306 has 64 divisors (see below), whose sum is σ = 438364765440. Its totient is φ = 55619524800.

The previous prime is 181968651299. The next prime is 181968651317. The reversal of 181968651306 is 603156869181.

It is a super-2 number, since 2×181968651306² (a number of 23 digits) contains 22 as substring.

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

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 31 ways as a sum of consecutive naturals, for example, 752325 + ... + 964328.

It is an arithmetic number, because the mean of its divisors is an integer number (6849449460).

Almost surely, 2^181968651306 is an apocalyptic number.

181968651306 is an abundant number, since it is smaller than the sum of its proper divisors (256396114134).

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

181968651306 is a wasteful number, since it uses less digits than its factorization.

181968651306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1716828 (or 1716822 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 181968651306 in words is "one hundred eighty-one billion, nine hundred sixty-eight million, six hundred fifty-one thousand, three hundred six".