16551105666061 has 16 divisors (see below), whose sum is σ = 17106226041600. Its totient is φ = 16006625489088.

The previous prime is 16551105666049. The next prime is 16551105666077. The reversal of 16551105666061 is 16066650115561.

It is a cyclic number.

It is not a de Polignac number, because 16551105666061 - 2⁴³ = 7755012643853 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16551105665996 and 16551105666014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16551105666461) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5118610 + ... + 7700803.

It is an arithmetic number, because the mean of its divisors is an integer number (1069139127600).

Almost surely, 2^{16551105666061} is an apocalyptic number.

It is an amenable number.

16551105666061 is a deficient number, since it is larger than the sum of its proper divisors (555120375539).

16551105666061 is a wasteful number, since it uses less digits than its factorization.

16551105666061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12819828.

The product of its (nonzero) digits is 972000, while the sum is 49.

The spelling of 16551105666061 in words is "sixteen trillion, five hundred fifty-one billion, one hundred five million, six hundred sixty-six thousand, sixty-one".