66755475 has 24 divisors (see below), whose sum is σ = 122633520. Its totient is φ = 35602560.

The previous prime is 66755471. The next prime is 66755483. The reversal of 66755475 is 57455766.

It is not a de Polignac number, because 66755475 - 2² = 66755471 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 66755475.

It is not an unprimeable number, because it can be changed into a prime (66755471) 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 23 ways as a sum of consecutive naturals, for example, 48774 + ... + 50123.

It is an arithmetic number, because the mean of its divisors is an integer number (5109730).

Almost surely, 2^66755475 is an apocalyptic number.

66755475 is a deficient number, since it is larger than the sum of its proper divisors (55878045).

66755475 is a wasteful number, since it uses less digits than its factorization.

66755475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98916 (or 98905 counting only the distinct ones).

The product of its digits is 882000, while the sum is 45.

The square root of 66755475 is about 8170.4023768723. The cubic root of 66755475 is about 405.6601032217.

The spelling of 66755475 in words is "sixty-six million, seven hundred fifty-five thousand, four hundred seventy-five".