655221165166 has 4 divisors (see below), whose sum is σ = 982831747752. Its totient is φ = 327610582582.

The previous prime is 655221165161. The next prime is 655221165173. The reversal of 655221165166 is 661561122556.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655221165161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 163805291290 + ... + 163805291293.

It is an arithmetic number, because the mean of its divisors is an integer number (245707936938).

Almost surely, 2^655221165166 is an apocalyptic number.

655221165166 is a deficient number, since it is larger than the sum of its proper divisors (327610582586).

655221165166 is a wasteful number, since it uses less digits than its factorization.

655221165166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327610582585.

The product of its digits is 648000, while the sum is 46.

The spelling of 655221165166 in words is "six hundred fifty-five billion, two hundred twenty-one million, one hundred sixty-five thousand, one hundred sixty-six".