16689316578 has 16 divisors (see below), whose sum is σ = 36413054496. Its totient is φ = 5057368640.

The previous prime is 16689316543. The next prime is 16689316583. The reversal of 16689316578 is 87561398661.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126434151 + ... + 126434282.

It is an arithmetic number, because the mean of its divisors is an integer number (2275815906).

Almost surely, 2^16689316578 is an apocalyptic number.

16689316578 is an abundant number, since it is smaller than the sum of its proper divisors (19723737918).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16689316578 is a wasteful number, since it uses less digits than its factorization.

16689316578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252868449.

The product of its digits is 13063680, while the sum is 60.

The spelling of 16689316578 in words is "sixteen billion, six hundred eighty-nine million, three hundred sixteen thousand, five hundred seventy-eight".