66675375 has 96 divisors (see below), whose sum is σ = 133555968. Its totient is φ = 31795200.

The previous prime is 66675361. The next prime is 66675383. The reversal of 66675375 is 57357666.

It is not a de Polignac number, because 66675375 - 2⁴ = 66675359 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 66675375.

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 95 ways as a sum of consecutive naturals, for example, 687327 + ... + 687423.

It is an arithmetic number, because the mean of its divisors is an integer number (1391208).

Almost surely, 2^66675375 is an apocalyptic number.

66675375 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66675375 is the 4365-th nonagonal number.

66675375 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

66675375 is a wasteful number, since it uses less digits than its factorization.

66675375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178 (or 165 counting only the distinct ones).

The product of its digits is 793800, while the sum is 45.

The square root of 66675375 is about 8165.4990661931. The cubic root of 66675375 is about 405.4977875503.

The spelling of 66675375 in words is "sixty-six million, six hundred seventy-five thousand, three hundred seventy-five".