66372503 has 16 divisors (see below), whose sum is σ = 72230400. Its totient is φ = 60799200.

The previous prime is 66372431. The next prime is 66372511. The reversal of 66372503 is 30527366.

It is a cyclic number.

It is not a de Polignac number, because 66372503 - 2¹⁰ = 66371479 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66372503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66372703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100388 + ... + 101046.

It is an arithmetic number, because the mean of its divisors is an integer number (4514400).

Almost surely, 2^66372503 is an apocalyptic number.

66372503 is a deficient number, since it is larger than the sum of its proper divisors (5857897).

66372503 is a wasteful number, since it uses less digits than its factorization.

66372503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 862.

The product of its (nonzero) digits is 22680, while the sum is 32.

The square root of 66372503 is about 8146.9321219708. The cubic root of 66372503 is about 404.8828660903.

Adding to 66372503 its reverse (30527366), we get a palindrome (96899869).

The spelling of 66372503 in words is "sixty-six million, three hundred seventy-two thousand, five hundred three".