16679980385 has 4 divisors (see below), whose sum is σ = 20015976468. Its totient is φ = 13343984304.

The previous prime is 16679980381. The next prime is 16679980393. The reversal of 16679980385 is 58308997661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58308997661 = 1171 ⋅49794191.

It can be written as a sum of positive squares in 2 ways, for example, as 10425226816 + 6254753569 = 102104^2 + 79087^2 .

It is a cyclic number.

It is not a de Polignac number, because 16679980385 - 2² = 16679980381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16679980381) 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, 1667998034 + ... + 1667998043.

It is an arithmetic number, because the mean of its divisors is an integer number (5003994117).

Almost surely, 2^16679980385 is an apocalyptic number.

It is an amenable number.

16679980385 is a deficient number, since it is larger than the sum of its proper divisors (3335996083).

16679980385 is an equidigital number, since it uses as much as digits as its factorization.

16679980385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3335996082.

The product of its (nonzero) digits is 19595520, while the sum is 62.

The spelling of 16679980385 in words is "sixteen billion, six hundred seventy-nine million, nine hundred eighty thousand, three hundred eighty-five".