67135681 has 8 divisors (see below), whose sum is σ = 67649120. Its totient is φ = 66624768.

The previous prime is 67135661. The next prime is 67135697. The reversal of 67135681 is 18653176.

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 67135681 - 2¹⁵ = 67102913 is a prime.

It is a super-2 number, since 2×67135681² = 9014399326667522, which contains 22 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 67135681.

It is not an unprimeable number, because it can be changed into a prime (67135631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116065 + ... + 116641.

It is an arithmetic number, because the mean of its divisors is an integer number (8456140).

Almost surely, 2^67135681 is an apocalyptic number.

It is an amenable number.

67135681 is a deficient number, since it is larger than the sum of its proper divisors (513439).

67135681 is a wasteful number, since it uses less digits than its factorization.

67135681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263.

The product of its digits is 30240, while the sum is 37.

The square root of 67135681 is about 8193.6366163017. The cubic root of 67135681 is about 406.4287918027.

The spelling of 67135681 in words is "sixty-seven million, one hundred thirty-five thousand, six hundred eighty-one".