266663880 has 192 divisors, whose sum is σ = 1034208000. Its totient is φ = 60939648.

The previous prime is 266663869. The next prime is 266663897. The reversal of 266663880 is 88366662.

It is a super-2 number, since 2×266663880² = 142219249793308800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50401 + ... + 55439.

It is an arithmetic number, because the mean of its divisors is an integer number (5386500).

Almost surely, 2^266663880 is an apocalyptic number.

266663880 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 266663880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (517104000).

266663880 is an abundant number, since it is smaller than the sum of its proper divisors (767544120).

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

266663880 is a wasteful number, since it uses less digits than its factorization.

266663880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5073 (or 5056 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 266663880 is about 16329.8462944389. The cubic root of 266663880 is about 643.6573476484.

The spelling of 266663880 in words is "two hundred sixty-six million, six hundred sixty-three thousand, eight hundred eighty".