655166161 has 8 divisors (see below), whose sum is σ = 706426280. Its totient is φ = 604029312.

The previous prime is 655166143. The next prime is 655166177. The reversal of 655166161 is 161661556.

It can be written as a sum of positive squares in 4 ways, for example, as 76475025 + 578691136 = 8745^2 + 24056^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 655166161 - 2¹⁹ = 654641873 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 655166161.

It is not an unprimeable number, because it can be changed into a prime (655166131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19620 + ... + 41173.

It is an arithmetic number, because the mean of its divisors is an integer number (88303285).

Almost surely, 2^655166161 is an apocalyptic number.

It is an amenable number.

655166161 is a deficient number, since it is larger than the sum of its proper divisors (51260119).

655166161 is a wasteful number, since it uses less digits than its factorization.

655166161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61635.

The product of its digits is 32400, while the sum is 37.

The square root of 655166161 is about 25596.2138020450. The cubic root of 655166161 is about 868.5279908455.

The spelling of 655166161 in words is "six hundred fifty-five million, one hundred sixty-six thousand, one hundred sixty-one".