16105557066665 has 32 divisors (see below), whose sum is σ = 21264577754112. Its totient is φ = 11612778840000.

The previous prime is 16105557066653. The next prime is 16105557066671. The reversal of 16105557066665 is 56666075550161.

It is a happy number.

It is not a de Polignac number, because 16105557066665 - 2⁶ = 16105557066601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6607490 + ... + 8710340.

It is an arithmetic number, because the mean of its divisors is an integer number (664518054816).

Almost surely, 2^{16105557066665} is an apocalyptic number.

It is an amenable number.

16105557066665 is a deficient number, since it is larger than the sum of its proper divisors (5159020687447).

16105557066665 is a wasteful number, since it uses less digits than its factorization.

16105557066665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104061.

The product of its (nonzero) digits is 34020000, while the sum is 59.

The spelling of 16105557066665 in words is "sixteen trillion, one hundred five billion, five hundred fifty-seven million, sixty-six thousand, six hundred sixty-five".