66665535 has 8 divisors (see below), whose sum is σ = 106664880. Its totient is φ = 35554944.

The previous prime is 66665513. The next prime is 66665537. The reversal of 66665535 is 53556666.

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

It is not a de Polignac number, because 66665535 - 2⁹ = 66665023 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665537) 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, 2222170 + ... + 2222199.

It is an arithmetic number, because the mean of its divisors is an integer number (13333110).

Almost surely, 2^66665535 is an apocalyptic number.

66665535 is a deficient number, since it is larger than the sum of its proper divisors (39999345).

66665535 is a wasteful number, since it uses less digits than its factorization.

66665535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444377.

The product of its digits is 486000, while the sum is 42.

The square root of 66665535 is about 8164.8965088359. The cubic root of 66665535 is about 405.4778386835.

The spelling of 66665535 in words is "sixty-six million, six hundred sixty-five thousand, five hundred thirty-five".