66505503 has 8 divisors (see below), whose sum is σ = 88750000. Its totient is φ = 44299008.

The previous prime is 66505499. The next prime is 66505519. The reversal of 66505503 is 30550566.

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

It is not a de Polignac number, because 66505503 - 2² = 66505499 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 (66505583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5128 + ... + 12621.

It is an arithmetic number, because the mean of its divisors is an integer number (11093750).

Almost surely, 2^66505503 is an apocalyptic number.

66505503 is a deficient number, since it is larger than the sum of its proper divisors (22244497).

66505503 is a wasteful number, since it uses less digits than its factorization.

66505503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19001.

The product of its (nonzero) digits is 13500, while the sum is 30.

The square root of 66505503 is about 8155.0906187485. The cubic root of 66505503 is about 405.1531260633.

The spelling of 66505503 in words is "sixty-six million, five hundred five thousand, five hundred three".