16666819697 has 16 divisors (see below), whose sum is σ = 18239364864. Its totient is φ = 15103920000.

The previous prime is 16666819681. The next prime is 16666819699. The reversal of 16666819697 is 79691866661.

It is a cyclic number.

It is not a de Polignac number, because 16666819697 - 2⁴ = 16666819681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16666819699) 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, 7088072 + ... + 7090422.

It is an arithmetic number, because the mean of its divisors is an integer number (1139960304).

Almost surely, 2^16666819697 is an apocalyptic number.

It is an amenable number.

16666819697 is a deficient number, since it is larger than the sum of its proper divisors (1572545167).

16666819697 is a wasteful number, since it uses less digits than its factorization.

16666819697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4120.

The product of its digits is 35271936, while the sum is 65.

The spelling of 16666819697 in words is "sixteen billion, six hundred sixty-six million, eight hundred nineteen thousand, six hundred ninety-seven".