65660881 has 8 divisors (see below), whose sum is σ = 77140224. Its totient is φ = 55099920.

The previous prime is 65660863. The next prime is 65660887. The reversal of 65660881 is 18806656.

It is a happy number.

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 65660881 - 2⁵ = 65660849 is a prime.

It is a super-2 number, since 2×65660881² = 8622702587392322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (65660887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229441 + ... + 229726.

It is an arithmetic number, because the mean of its divisors is an integer number (9642528).

Almost surely, 2^65660881 is an apocalyptic number.

It is an amenable number.

65660881 is a deficient number, since it is larger than the sum of its proper divisors (11479343).

65660881 is a wasteful number, since it uses less digits than its factorization.

65660881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459191.

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 65660881 is about 8103.1401937767. The cubic root of 65660881 is about 403.4306610434.

The spelling of 65660881 in words is "sixty-five million, six hundred sixty thousand, eight hundred eighty-one".