266656416 has 96 divisors (see below), whose sum is σ = 771503040. Its totient is φ = 80123904.

The previous prime is 266656387. The next prime is 266656417. The reversal of 266656416 is 614656662.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×266656416² = 142211288387930112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (266656417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51180 + ... + 56148.

It is an arithmetic number, because the mean of its divisors is an integer number (8036490).

Almost surely, 2^266656416 is an apocalyptic number.

266656416 is a gapful number since it is divisible by the number (26) 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 266656416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (385751520).

266656416 is an abundant number, since it is smaller than the sum of its proper divisors (504846624).

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

266656416 is a wasteful number, since it uses less digits than its factorization.

266656416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5038 (or 5030 counting only the distinct ones).

The product of its digits is 311040, while the sum is 42.

The square root of 266656416 is about 16329.6177542525. The cubic root of 266656416 is about 643.6513422065.

The spelling of 266656416 in words is "two hundred sixty-six million, six hundred fifty-six thousand, four hundred sixteen".