66345042503 has 16 divisors (see below), whose sum is σ = 71886528000. Its totient is φ = 60990992256.

The previous prime is 66345042487. The next prime is 66345042539. The reversal of 66345042503 is 30524054366.

It is a happy number.

66345042503 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66345042503 - 2⁴ = 66345042487 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 (66345072503) 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, 315500 + ... + 481902.

It is an arithmetic number, because the mean of its divisors is an integer number (4492908000).

Almost surely, 2^66345042503 is an apocalyptic number.

66345042503 is a deficient number, since it is larger than the sum of its proper divisors (5541485497).

66345042503 is a wasteful number, since it uses less digits than its factorization.

66345042503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166966.

The product of its (nonzero) digits is 259200, while the sum is 38.

Adding to 66345042503 its reverse (30524054366), we get a palindrome (96869096869).

The spelling of 66345042503 in words is "sixty-six billion, three hundred forty-five million, forty-two thousand, five hundred three".