66745475 has 12 divisors (see below), whose sum is σ = 82865976. Its totient is φ = 53330880.

The previous prime is 66745457. The next prime is 66745477. The reversal of 66745475 is 57454766.

It is not a de Polignac number, because 66745475 - 2⁶ = 66745411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66745477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37199 + ... + 38951.

It is an arithmetic number, because the mean of its divisors is an integer number (6905498).

Almost surely, 2^66745475 is an apocalyptic number.

66745475 is a deficient number, since it is larger than the sum of its proper divisors (16120501).

66745475 is a wasteful number, since it uses less digits than its factorization.

66745475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3286 (or 3281 counting only the distinct ones).

The product of its digits is 705600, while the sum is 44.

The square root of 66745475 is about 8169.7903889880. The cubic root of 66745475 is about 405.6398461885.

The spelling of 66745475 in words is "sixty-six million, seven hundred forty-five thousand, four hundred seventy-five".