66515502503 has 4 divisors (see below), whose sum is σ = 66625083840. Its totient is φ = 66405921168.

The previous prime is 66515502433. The next prime is 66515502509. The reversal of 66515502503 is 30520551566.

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

It is a cyclic number.

It is not a de Polignac number, because 66515502503 - 2¹⁸ = 66515240359 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 (66515502509) 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 3 ways as a sum of consecutive naturals, for example, 54789758 + ... + 54790971.

It is an arithmetic number, because the mean of its divisors is an integer number (16656270960).

Almost surely, 2^66515502503 is an apocalyptic number.

66515502503 is a deficient number, since it is larger than the sum of its proper divisors (109581337).

66515502503 is a wasteful number, since it uses less digits than its factorization.

66515502503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109581336.

The product of its (nonzero) digits is 135000, while the sum is 38.

The spelling of 66515502503 in words is "sixty-six billion, five hundred fifteen million, five hundred two thousand, five hundred three".