266185140 has 72 divisors (see below), whose sum is σ = 807091488. Its totient is φ = 65520000.

The previous prime is 266185121. The next prime is 266185159. The reversal of 266185140 is 41581662.

It is an interprime number because it is at equal distance from previous prime (266185121) and next prime (266185159).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2986 + ... + 23265.

It is an arithmetic number, because the mean of its divisors is an integer number (11209604).

Almost surely, 2^266185140 is an apocalyptic number.

266185140 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 266185140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (403545744).

266185140 is an abundant number, since it is smaller than the sum of its proper divisors (540906348).

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

266185140 is a wasteful number, since it uses less digits than its factorization.

266185140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26289 (or 26274 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 266185140 is about 16315.1812738933. The cubic root of 266185140 is about 643.2719322382.

The spelling of 266185140 in words is "two hundred sixty-six million, one hundred eighty-five thousand, one hundred forty".