66050505503 has 4 divisors (see below), whose sum is σ = 66446017680. Its totient is φ = 65654993328.

The previous prime is 66050505463. The next prime is 66050505523. The reversal of 66050505503 is 30550505066.

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 66050505503 - 2¹⁴ = 66050489119 is a prime.

It is a super-3 number, since 3×66050505503³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66050505523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197755838 + ... + 197756171.

It is an arithmetic number, because the mean of its divisors is an integer number (16611504420).

Almost surely, 2^66050505503 is an apocalyptic number.

66050505503 is a deficient number, since it is larger than the sum of its proper divisors (395512177).

66050505503 is a wasteful number, since it uses less digits than its factorization.

66050505503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395512176.

The product of its (nonzero) digits is 67500, while the sum is 35.

The spelling of 66050505503 in words is "sixty-six billion, fifty million, five hundred five thousand, five hundred three".