266061644165 has 8 divisors (see below), whose sum is σ = 319280958360. Its totient is φ = 212844658432.

The previous prime is 266061644159. The next prime is 266061644263. The reversal of 266061644165 is 561446160662.

It can be written as a sum of positive squares in 4 ways, for example, as 102553017121 + 163508627044 = 320239^2 + 404362^2 .

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 266061644165 - 2³² = 261766676869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320000 + ... + 796569.

It is an arithmetic number, because the mean of its divisors is an integer number (39910119795).

Almost surely, 2^266061644165 is an apocalyptic number.

It is an amenable number.

266061644165 is a deficient number, since it is larger than the sum of its proper divisors (53219314195).

266061644165 is a wasteful number, since it uses less digits than its factorization.

266061644165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164231.

The product of its (nonzero) digits is 1244160, while the sum is 47.

The spelling of 266061644165 in words is "two hundred sixty-six billion, sixty-one million, six hundred forty-four thousand, one hundred sixty-five".