16561010505010 has 16 divisors (see below), whose sum is σ = 31563337668696. Its totient is φ = 6234733366528.

The previous prime is 16561010505007. The next prime is 16561010505031. The reversal of 16561010505010 is 1050501016561.

It can be written as a sum of positive squares in 4 ways, for example, as 11688938750281 + 4872071754729 = 3418909^2 + 2207277^2 .

It is an alternating number because its digits alternate between odd and even.

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, 48708854257 + ... + 48708854596.

Almost surely, 2^{16561010505010} is an apocalyptic number.

16561010505010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16561010505010 is a deficient number, since it is larger than the sum of its proper divisors (15002327163686).

16561010505010 is a wasteful number, since it uses less digits than its factorization.

16561010505010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97417708877.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 16561010505010 in words is "sixteen trillion, five hundred sixty-one billion, ten million, five hundred five thousand, ten".