66801305 has 8 divisors (see below), whose sum is σ = 81127872. Its totient is φ = 52796848.

The previous prime is 66801289. The next prime is 66801323. The reversal of 66801305 is 50310866.

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 66801305 - 2⁴ = 66801289 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 80069 + ... + 80898.

It is an arithmetic number, because the mean of its divisors is an integer number (10140984).

Almost surely, 2^66801305 is an apocalyptic number.

It is an amenable number.

66801305 is a deficient number, since it is larger than the sum of its proper divisors (14326567).

66801305 is a wasteful number, since it uses less digits than its factorization.

66801305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161055.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66801305 is about 8173.2065310990. The cubic root of 66801305 is about 405.7529153324.

It can be divided in two parts, 6680 and 1305, that multiplied together give a triangular number (8717400 = T₄₁₇₅).

The spelling of 66801305 in words is "sixty-six million, eight hundred one thousand, three hundred five".