66475487 has 8 divisors (see below), whose sum is σ = 71856960. Its totient is φ = 61132320.

The previous prime is 66475481. The next prime is 66475489. The reversal of 66475487 is 78457466.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66475487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66475481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5912 + ... + 12957.

It is an arithmetic number, because the mean of its divisors is an integer number (8982120).

Almost surely, 2^66475487 is an apocalyptic number.

66475487 is a deficient number, since it is larger than the sum of its proper divisors (5381473).

66475487 is a wasteful number, since it uses less digits than its factorization.

66475487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19153.

The product of its digits is 1128960, while the sum is 47.

The square root of 66475487 is about 8153.2500881550. The cubic root of 66475487 is about 405.0921641594.

The spelling of 66475487 in words is "sixty-six million, four hundred seventy-five thousand, four hundred eighty-seven".