16661052747265 has 4 divisors (see below), whose sum is σ = 19993263296724. Its totient is φ = 13328842197808.

The previous prime is 16661052747217. The next prime is 16661052747271. The reversal of 16661052747265 is 56274725016661.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10029933338049 + 6631119409216 = 3167007^2 + 2575096^2 .

It is a cyclic number.

It is not a de Polignac number, because 16661052747265 - 2¹⁷ = 16661052616193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1666105274722 + ... + 1666105274731.

It is an arithmetic number, because the mean of its divisors is an integer number (4998315824181).

Almost surely, 2^{16661052747265} is an apocalyptic number.

It is an amenable number.

16661052747265 is a deficient number, since it is larger than the sum of its proper divisors (3332210549459).

16661052747265 is an equidigital number, since it uses as much as digits as its factorization.

16661052747265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3332210549458.

The product of its (nonzero) digits is 25401600, while the sum is 58.

The spelling of 16661052747265 in words is "sixteen trillion, six hundred sixty-one billion, fifty-two million, seven hundred forty-seven thousand, two hundred sixty-five".