266244261500 has 96 divisors (see below), whose sum is σ = 664724860800. Its totient is φ = 91259136000.

The previous prime is 266244261457. The next prime is 266244261539. The reversal of 266244261500 is 5162442662.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17005676 + ... + 17021324.

It is an arithmetic number, because the mean of its divisors is an integer number (6924217300).

Almost surely, 2^266244261500 is an apocalyptic number.

266244261500 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 266244261500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (332362430400).

266244261500 is an abundant number, since it is smaller than the sum of its proper divisors (398480599300).

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

266244261500 is a wasteful number, since it uses less digits than its factorization.

266244261500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20536 (or 20524 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 266244261500 in words is "two hundred sixty-six billion, two hundred forty-four million, two hundred sixty-one thousand, five hundred".