136668081 has 8 divisors (see below), whose sum is σ = 198789984. Its totient is φ = 82829120.

The previous prime is 136668067. The next prime is 136668089. The reversal of 136668081 is 180866631.

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

It is not a de Polignac number, because 136668081 - 2⁷ = 136667953 is a prime.

It is a super-2 number, since 2×136668081² = 37356328728445122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (136668089) 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, 2070696 + ... + 2070761.

It is an arithmetic number, because the mean of its divisors is an integer number (24848748).

Almost surely, 2^136668081 is an apocalyptic number.

136668081 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

136668081 is a deficient number, since it is larger than the sum of its proper divisors (62121903).

136668081 is a wasteful number, since it uses less digits than its factorization.

136668081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4141471.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 136668081 is about 11690.5124353041. The cubic root of 136668081 is about 515.0970138034.

The spelling of 136668081 in words is "one hundred thirty-six million, six hundred sixty-eight thousand, eighty-one".