266161140 has 240 divisors, whose sum is σ = 975744000. Its totient is φ = 60709824.

The previous prime is 266161127. The next prime is 266161151. The reversal of 266161140 is 41161662.

266161140 is a `hidden beast` number, since 2 + 6 + 6 + 1 + 611 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 555421 + ... + 555899.

It is an arithmetic number, because the mean of its divisors is an integer number (4065600).

Almost surely, 2^266161140 is an apocalyptic number.

266161140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266161140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (487872000).

266161140 is an abundant number, since it is smaller than the sum of its proper divisors (709582860).

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

266161140 is a wasteful number, since it uses less digits than its factorization.

266161140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 266161140 is about 16314.4457460252. The cubic root of 266161140 is about 643.2525985890.

The spelling of 266161140 in words is "two hundred sixty-six million, one hundred sixty-one thousand, one hundred forty".