266229389440 has 192 divisors, whose sum is σ = 772684223040. Its totient is φ = 85908897792.

The previous prime is 266229389429. The next prime is 266229389473. The reversal of 266229389440 is 44983922662.

266229389440 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1191907 + ... + 1397533.

It is an arithmetic number, because the mean of its divisors is an integer number (4024396995).

Almost surely, 2^266229389440 is an apocalyptic number.

266229389440 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 266229389440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386342111520).

266229389440 is an abundant number, since it is smaller than the sum of its proper divisors (506454833600).

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

266229389440 is a wasteful number, since it uses less digits than its factorization.

266229389440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205687 (or 205658 counting only the distinct ones).

The product of its (nonzero) digits is 8957952, while the sum is 55.

The spelling of 266229389440 in words is "two hundred sixty-six billion, two hundred twenty-nine million, three hundred eighty-nine thousand, four hundred forty".