66807503 has 8 divisors (see below), whose sum is σ = 78984480. Its totient is φ = 55288800.

The previous prime is 66807457. The next prime is 66807547. The reversal of 66807503 is 30570866.

It is a happy number.

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

It is not a de Polignac number, because 66807503 - 2¹⁰ = 66806479 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 (66807593) 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, 164348 + ... + 164753.

It is an arithmetic number, because the mean of its divisors is an integer number (9873060).

Almost surely, 2^66807503 is an apocalyptic number.

66807503 is a deficient number, since it is larger than the sum of its proper divisors (12176977).

66807503 is a wasteful number, since it uses less digits than its factorization.

66807503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329137.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 66807503 is about 8173.5856880564. The cubic root of 66807503 is about 405.7654638836.

The spelling of 66807503 in words is "sixty-six million, eight hundred seven thousand, five hundred three".