16161661161065 has 16 divisors (see below), whose sum is σ = 22228438718592. Its totient is φ = 11050344518784.

The previous prime is 16161661161059. The next prime is 16161661161073. The reversal of 16161661161065 is 56016116616161.

It is a cyclic number.

It is not a de Polignac number, because 16161661161065 - 2⁴ = 16161661161049 is a prime.

It is a super-3 number, since 3×16161661161065³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 665350604 + ... + 665374893.

It is an arithmetic number, because the mean of its divisors is an integer number (1389277419912).

Almost surely, 2^{16161661161065} is an apocalyptic number.

It is an amenable number.

16161661161065 is a deficient number, since it is larger than the sum of its proper divisors (6066777557527).

16161661161065 is a wasteful number, since it uses less digits than its factorization.

16161661161065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330725856.

The product of its (nonzero) digits is 233280, while the sum is 47.

The spelling of 16161661161065 in words is "sixteen trillion, one hundred sixty-one billion, six hundred sixty-one million, one hundred sixty-one thousand, sixty-five".