66661235 has 16 divisors (see below), whose sum is σ = 82625376. Its totient is φ = 51591168.

The previous prime is 66661207. The next prime is 66661241. The reversal of 66661235 is 53216666.

It is a cyclic number.

It is not a de Polignac number, because 66661235 - 2⁶ = 66661171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66661195 and 66661204.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 34772 + ... + 36638.

It is an arithmetic number, because the mean of its divisors is an integer number (5164086).

Almost surely, 2^66661235 is an apocalyptic number.

66661235 is a deficient number, since it is larger than the sum of its proper divisors (15964141).

66661235 is a wasteful number, since it uses less digits than its factorization.

66661235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102.

The product of its digits is 38880, while the sum is 35.

The square root of 66661235 is about 8164.6331822073. The cubic root of 66661235 is about 405.4691205745.

The spelling of 66661235 in words is "sixty-six million, six hundred sixty-one thousand, two hundred thirty-five".