181395668 has 6 divisors (see below), whose sum is σ = 317442426. Its totient is φ = 90697832.

The previous prime is 181395649. The next prime is 181395673. The reversal of 181395668 is 866593181.

It can be written as a sum of positive squares in only one way, i.e., 113465104 + 67930564 = 10652^2 + 8242^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22674455 + ... + 22674462.

It is an arithmetic number, because the mean of its divisors is an integer number (52907071).

Almost surely, 2^181395668 is an apocalyptic number.

It is an amenable number.

181395668 is a deficient number, since it is larger than the sum of its proper divisors (136046758).

181395668 is a wasteful number, since it uses less digits than its factorization.

181395668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45348921 (or 45348919 counting only the distinct ones).

The product of its digits is 311040, while the sum is 47.

The square root of 181395668 is about 13468.3209049978. The cubic root of 181395668 is about 566.0771661200.

The spelling of 181395668 in words is "one hundred eighty-one million, three hundred ninety-five thousand, six hundred sixty-eight".