66788755 has 16 divisors (see below), whose sum is σ = 87600384. Its totient is φ = 48480480.

The previous prime is 66788753. The next prime is 66788783. The reversal of 66788755 is 55788766.

It is not a de Polignac number, because 66788755 - 2¹ = 66788753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66788753) 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 15 ways as a sum of consecutive naturals, for example, 42514 + ... + 44056.

It is an arithmetic number, because the mean of its divisors is an integer number (5475024).

Almost surely, 2^66788755 is an apocalyptic number.

66788755 is a deficient number, since it is larger than the sum of its proper divisors (20811629).

66788755 is a wasteful number, since it uses less digits than its factorization.

66788755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346.

The product of its digits is 2822400, while the sum is 52.

The square root of 66788755 is about 8172.4387425052. The cubic root of 66788755 is about 405.7275040623.

The spelling of 66788755 in words is "sixty-six million, seven hundred eighty-eight thousand, seven hundred fifty-five".