266501664 has 240 divisors, whose sum is σ = 922078080. Its totient is φ = 74442240.

The previous prime is 266501617. The next prime is 266501687. The reversal of 266501664 is 466105662.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 370297 + ... + 371015.

It is an arithmetic number, because the mean of its divisors is an integer number (3841992).

Almost surely, 2^266501664 is an apocalyptic number.

266501664 is a gapful number since it is divisible by the number (24) 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 266501664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461039040).

266501664 is an abundant number, since it is smaller than the sum of its proper divisors (655576416).

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

266501664 is a wasteful number, since it uses less digits than its factorization.

266501664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 266501664 is about 16324.8786825508. The cubic root of 266501664 is about 643.5268054102.

The spelling of 266501664 in words is "two hundred sixty-six million, five hundred one thousand, six hundred sixty-four".