216717027775551 has 24 divisors (see below), whose sum is σ = 323434182348576. Its totient is φ = 139755510847680.

The previous prime is 216717027775531. The next prime is 216717027775561. The reversal of 216717027775551 is 155577720717612.

It is a happy number.

216717027775551 is a `hidden beast` number, since 2 + 1 + 6 + 7 + 1 + 7 + 0 + 2 + 7 + 7 + 75 + 551 = 666.

It is not a de Polignac number, because 216717027775551 - 2²³ = 216717019386943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216717027775531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3199497060 + ... + 3199564793.

It is an arithmetic number, because the mean of its divisors is an integer number (13476424264524).

Almost surely, 2^{216717027775551} is an apocalyptic number.

216717027775551 is a deficient number, since it is larger than the sum of its proper divisors (106717154573025).

216717027775551 is a wasteful number, since it uses less digits than its factorization.

216717027775551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6399061983 (or 6399061980 counting only the distinct ones).

The product of its (nonzero) digits is 50421000, while the sum is 63.

The spelling of 216717027775551 in words is "two hundred sixteen trillion, seven hundred seventeen billion, twenty-seven million, seven hundred seventy-five thousand, five hundred fifty-one".