181968655 has 8 divisors (see below), whose sum is σ = 238213584. Its totient is φ = 132340800.

The previous prime is 181968623. The next prime is 181968659. The reversal of 181968655 is 556869181.

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

It is not a de Polignac number, because 181968655 - 2⁵ = 181968623 is a prime.

It is a super-2 number, since 2×181968655² = 66225182805018050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181968599 and 181968608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181968659) 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, 1654206 + ... + 1654315.

It is an arithmetic number, because the mean of its divisors is an integer number (29776698).

Almost surely, 2^181968655 is an apocalyptic number.

181968655 is a deficient number, since it is larger than the sum of its proper divisors (56244929).

181968655 is a wasteful number, since it uses less digits than its factorization.

181968655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3308537.

The product of its digits is 518400, while the sum is 49.

The square root of 181968655 is about 13489.5757902167. The cubic root of 181968655 is about 566.6725752940.

The spelling of 181968655 in words is "one hundred eighty-one million, nine hundred sixty-eight thousand, six hundred fifty-five".