16689316577 has 4 divisors (see below), whose sum is σ = 17567701680. Its totient is φ = 15810931476.

The previous prime is 16689316543. The next prime is 16689316583. The reversal of 16689316577 is 77561398661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77561398661 = 80789 ⋅960049.

It is a cyclic number.

It is not a de Polignac number, because 16689316577 - 2⁶ = 16689316513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16689316277) 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, 439192523 + ... + 439192560.

It is an arithmetic number, because the mean of its divisors is an integer number (4391925420).

Almost surely, 2^16689316577 is an apocalyptic number.

It is an amenable number.

16689316577 is a deficient number, since it is larger than the sum of its proper divisors (878385103).

16689316577 is an equidigital number, since it uses as much as digits as its factorization.

16689316577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 878385102.

The product of its digits is 11430720, while the sum is 59.

The spelling of 16689316577 in words is "sixteen billion, six hundred eighty-nine million, three hundred sixteen thousand, five hundred seventy-seven".