217876077108051 has 4 divisors (see below), whose sum is σ = 290501436144072. Its totient is φ = 145250718072032.

The previous prime is 217876077108049. The next prime is 217876077108097. The reversal of 217876077108051 is 150801770678712.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 217876077108051 - 2¹ = 217876077108049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (217876077100051) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36312679518006 + ... + 36312679518011.

It is an arithmetic number, because the mean of its divisors is an integer number (72625359036018).

Almost surely, 2^{217876077108051} is an apocalyptic number.

217876077108051 is a deficient number, since it is larger than the sum of its proper divisors (72625359036021).

217876077108051 is an equidigital number, since it uses as much as digits as its factorization.

217876077108051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72625359036020.

The product of its (nonzero) digits is 9219840, while the sum is 60.

The spelling of 217876077108051 in words is "two hundred seventeen trillion, eight hundred seventy-six billion, seventy-seven million, one hundred eight thousand, fifty-one".