20016666503 has 4 divisors (see below), whose sum is σ = 20290867488. Its totient is φ = 19742465520.

The previous prime is 20016666499. The next prime is 20016666521. The reversal of 20016666503 is 30566661002.

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 20016666503 - 2² = 20016666499 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 (20016666563) 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, 137100383 + ... + 137100528.

It is an arithmetic number, because the mean of its divisors is an integer number (5072716872).

Almost surely, 2^20016666503 is an apocalyptic number.

20016666503 is a deficient number, since it is larger than the sum of its proper divisors (274200985).

20016666503 is an equidigital number, since it uses as much as digits as its factorization.

20016666503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274200984.

The product of its (nonzero) digits is 38880, while the sum is 35.

The spelling of 20016666503 in words is "twenty billion, sixteen million, six hundred sixty-six thousand, five hundred three".