266161590 has 48 divisors (see below), whose sum is σ = 693031248. Its totient is φ = 70872768.

The previous prime is 266161583. The next prime is 266161591. The reversal of 266161590 is 95161662.

266161590 is a `hidden beast` number, since 2 + 6 + 6 + 1 + 61 + 590 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266161591) 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 in 23 ways as a sum of consecutive naturals, for example, 75037 + ... + 78503.

It is an arithmetic number, because the mean of its divisors is an integer number (14438151).

Almost surely, 2^266161590 is an apocalyptic number.

266161590 is an abundant number, since it is smaller than the sum of its proper divisors (426869658).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266161590 is a wasteful number, since it uses less digits than its factorization.

266161590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4333 (or 4330 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 266161590 is about 16314.4595374778. The cubic root of 266161590 is about 643.2529611056.

It can be divided in two parts, 26 and 6161590, that added together give a palindrome (6161616).

The spelling of 266161590 in words is "two hundred sixty-six million, one hundred sixty-one thousand, five hundred ninety".