66145503 has 4 divisors (see below), whose sum is σ = 88194008. Its totient is φ = 44097000.

The previous prime is 66145489. The next prime is 66145531. The reversal of 66145503 is 30554166.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66145503 - 2²² = 61951199 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 (66145543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11024248 + ... + 11024253.

It is an arithmetic number, because the mean of its divisors is an integer number (22048502).

Almost surely, 2^66145503 is an apocalyptic number.

66145503 is a deficient number, since it is larger than the sum of its proper divisors (22048505).

66145503 is a wasteful number, since it uses less digits than its factorization.

66145503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22048504.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66145503 is about 8132.9885650971. The cubic root of 66145503 is about 404.4207601259.

Adding to 66145503 its reverse (30554166), we get a palindrome (96699669).

It can be divided in two parts, 661 and 45503, that added together give a palindrome (46164).

The spelling of 66145503 in words is "sixty-six million, one hundred forty-five thousand, five hundred three".