16561077064 has 32 divisors (see below), whose sum is σ = 35512721280. Its totient is φ = 7092664704.

The previous prime is 16561077059. The next prime is 16561077077. The reversal of 16561077064 is 46077016561.

It is a self number, because there is not a number n which added to its sum of digits gives 16561077064.

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, 21157 + ... + 183220.

It is an arithmetic number, because the mean of its divisors is an integer number (1109772540).

Almost surely, 2^16561077064 is an apocalyptic number.

16561077064 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16561077064 is an abundant number, since it is smaller than the sum of its proper divisors (18951644216).

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

16561077064 is a wasteful number, since it uses less digits than its factorization.

16561077064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205837 (or 205833 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 16561077064 in words is "sixteen billion, five hundred sixty-one million, seventy-seven thousand, sixty-four".