16655172220551 has 16 divisors (see below), whose sum is σ = 22217535408096. Its totient is φ = 11098129437696.

The previous prime is 16655172220537. The next prime is 16655172220649. The reversal of 16655172220551 is 15502227155661.

It is a happy number.

It is not a de Polignac number, because 16655172220551 - 2¹⁸ = 16655171958407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16655172220551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16655172220051) 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, 83732751 + ... + 83931423.

It is an arithmetic number, because the mean of its divisors is an integer number (1388595963006).

Almost surely, 2^{16655172220551} is an apocalyptic number.

16655172220551 is a deficient number, since it is larger than the sum of its proper divisors (5562363187545).

16655172220551 is a wasteful number, since it uses less digits than its factorization.

16655172220551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211922.

The product of its (nonzero) digits is 1260000, while the sum is 48.

The spelling of 16655172220551 in words is "sixteen trillion, six hundred fifty-five billion, one hundred seventy-two million, two hundred twenty thousand, five hundred fifty-one".