16666668503 has 8 divisors (see below), whose sum is σ = 17991007200. Its totient is φ = 15392304928.

The previous prime is 16666668481. The next prime is 16666668509. The reversal of 16666668503 is 30586666661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16666668503 - 2¹⁸ = 16666406359 is a prime.

It is a super-2 number, since 2×16666668503² (a number of 21 digits) contains 22 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 (16666668509) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12493088 + ... + 12494421.

It is an arithmetic number, because the mean of its divisors is an integer number (2248875900).

Almost surely, 2^16666668503 is an apocalyptic number.

16666668503 is a deficient number, since it is larger than the sum of its proper divisors (1324338697).

16666668503 is a wasteful number, since it uses less digits than its factorization.

16666668503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24987561.

The product of its (nonzero) digits is 5598720, while the sum is 53.

The spelling of 16666668503 in words is "sixteen billion, six hundred sixty-six million, six hundred sixty-eight thousand, five hundred three".