66705763 has 4 divisors (see below), whose sum is σ = 66826080. Its totient is φ = 66585448.

The previous prime is 66705761. The next prime is 66705781. The reversal of 66705763 is 36750766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66705763 - 2¹ = 66705761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66705761) 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 3 ways as a sum of consecutive naturals, for example, 59323 + ... + 60436.

It is an arithmetic number, because the mean of its divisors is an integer number (16706520).

Almost surely, 2^66705763 is an apocalyptic number.

66705763 is a deficient number, since it is larger than the sum of its proper divisors (120317).

66705763 is a wasteful number, since it uses less digits than its factorization.

66705763 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120316.

The product of its (nonzero) digits is 158760, while the sum is 40.

The square root of 66705763 is about 8167.3596100576. The cubic root of 66705763 is about 405.5593814808.

The spelling of 66705763 in words is "sixty-six million, seven hundred five thousand, seven hundred sixty-three".