66336881 has 8 divisors (see below), whose sum is σ = 72960384. Its totient is φ = 59930640.

The previous prime is 66336877. The next prime is 66336887. The reversal of 66336881 is 18863366.

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

It is not a de Polignac number, because 66336881 - 2² = 66336877 is a prime.

It is a super-2 number, since 2×66336881² = 8801163561616322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66336887) 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, 53675 + ... + 54896.

It is an arithmetic number, because the mean of its divisors is an integer number (9120048).

Almost surely, 2^66336881 is an apocalyptic number.

It is an amenable number.

66336881 is a deficient number, since it is larger than the sum of its proper divisors (6623503).

66336881 is a wasteful number, since it uses less digits than its factorization.

66336881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108631.

The product of its digits is 124416, while the sum is 41.

The square root of 66336881 is about 8144.7456068314. The cubic root of 66336881 is about 404.8104198322.

The spelling of 66336881 in words is "sixty-six million, three hundred thirty-six thousand, eight hundred eighty-one".