168612381 has 24 divisors (see below), whose sum is σ = 290581440. Its totient is φ = 96349176.

The previous prime is 168612371. The next prime is 168612391. The reversal of 168612381 is 183216861.

168612381 is a `hidden beast` number, since 1 + 6 + 8 + 612 + 38 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (168612371) and next prime (168612391).

It is not a de Polignac number, because 168612381 - 2¹⁰ = 168611357 is a prime.

It is a super-2 number, since 2×168612381² = 56860270052978322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168612361) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62401 + ... + 65046.

It is an arithmetic number, because the mean of its divisors is an integer number (12107560).

Almost surely, 2^168612381 is an apocalyptic number.

It is an amenable number.

168612381 is a deficient number, since it is larger than the sum of its proper divisors (121969059).

168612381 is a wasteful number, since it uses less digits than its factorization.

168612381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127470 (or 127457 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 168612381 is about 12985.0830186025. The cubic root of 168612381 is about 552.4544638733.

The spelling of 168612381 in words is "one hundred sixty-eight million, six hundred twelve thousand, three hundred eighty-one".