66754775 has 6 divisors (see below), whose sum is σ = 82775952. Its totient is φ = 53403800.

The previous prime is 66754769. The next prime is 66754799. The reversal of 66754775 is 57745766.

It is not a de Polignac number, because 66754775 - 2⁴ = 66754759 is a prime.

It is a Duffinian number.

It is a congruent 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 5 ways as a sum of consecutive naturals, for example, 1335071 + ... + 1335120.

It is an arithmetic number, because the mean of its divisors is an integer number (13795992).

Almost surely, 2^66754775 is an apocalyptic number.

66754775 is a deficient number, since it is larger than the sum of its proper divisors (16021177).

66754775 is a wasteful number, since it uses less digits than its factorization.

66754775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2670201 (or 2670196 counting only the distinct ones).

The product of its digits is 1234800, while the sum is 47.

The square root of 66754775 is about 8170.3595392125. The cubic root of 66754775 is about 405.6586852952.

Subtracting from 66754775 its reverse (57745766), we obtain a palindrome (9009009).

The spelling of 66754775 in words is "sixty-six million, seven hundred fifty-four thousand, seven hundred seventy-five".