221166791664007 has 6 divisors (see below), whose sum is σ = 257275655609208. Its totient is φ = 189571535711964.

The previous prime is 221166791663957. The next prime is 221166791664017. The reversal of 221166791664007 is 700466197661122.

It is a de Polignac number, because none of the positive numbers 2^k-221166791664007 is a prime.

It is the 14871678-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221166791664017) by changing a digit.

It is a nontrivial repunit in base 14871677.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2256803996523 + ... + 2256803996620.

It is an arithmetic number, because the mean of its divisors is an integer number (42879275934868).

Almost surely, 2^{221166791664007} is an apocalyptic number.

221166791664007 is a deficient number, since it is larger than the sum of its proper divisors (36108863945201).

221166791664007 is an equidigital number, since it uses as much as digits as its factorization.

221166791664007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4513607993157 (or 4513607993150 counting only the distinct ones).

The product of its (nonzero) digits is 9144576, while the sum is 58.

The spelling of 221166791664007 in words is "two hundred twenty-one trillion, one hundred sixty-six billion, seven hundred ninety-one million, six hundred sixty-four thousand, seven".