66675538 has 8 divisors (see below), whose sum is σ = 100171260. Its totient is φ = 33285120.

The previous prime is 66675533. The next prime is 66675559. The reversal of 66675538 is 83557666.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 45118089 + 21557449 = 6717^2 + 4643^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66675533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24723 + ... + 27286.

Almost surely, 2^66675538 is an apocalyptic number.

66675538 is a deficient number, since it is larger than the sum of its proper divisors (33495722).

66675538 is a wasteful number, since it uses less digits than its factorization.

66675538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52652.

The product of its digits is 907200, while the sum is 46.

The square root of 66675538 is about 8165.5090472058. The cubic root of 66675538 is about 405.4981179876.

The spelling of 66675538 in words is "sixty-six million, six hundred seventy-five thousand, five hundred thirty-eight".