266661140 has 12 divisors (see below), whose sum is σ = 559988436. Its totient is φ = 106664448.

The previous prime is 266661113. The next prime is 266661173. The reversal of 266661140 is 41166662.

It can be written as a sum of positive squares in 2 ways, for example, as 196336144 + 70324996 = 14012^2 + 8386^2 .

It is a super-2 number, since 2×266661140² = 142216327172199200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 266661097 and 266661106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6666509 + ... + 6666548.

It is an arithmetic number, because the mean of its divisors is an integer number (46665703).

Almost surely, 2^266661140 is an apocalyptic number.

266661140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266661140 is an abundant number, since it is smaller than the sum of its proper divisors (293327296).

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

266661140 is a wasteful number, since it uses less digits than its factorization.

266661140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13333066 (or 13333064 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 266661140 is about 16329.7623987613. The cubic root of 266661140 is about 643.6551430914.

The spelling of 266661140 in words is "two hundred sixty-six million, six hundred sixty-one thousand, one hundred forty".