266391472320 has 168 divisors, whose sum is σ = 920210499936. Its totient is φ = 70732664832.

The previous prime is 266391472279. The next prime is 266391472363. The reversal of 266391472320 is 23274193662.

266391472320 is a `hidden beast` number, since 2 + 6 + 63 + 91 + 472 + 32 + 0 = 666.

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

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, 472549 + ... + 869531.

It is an arithmetic number, because the mean of its divisors is an integer number (5477443452).

Almost surely, 2^266391472320 is an apocalyptic number.

266391472320 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 266391472320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (460105249968).

266391472320 is an abundant number, since it is smaller than the sum of its proper divisors (653819027616).

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

266391472320 is a wasteful number, since it uses less digits than its factorization.

266391472320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397239 (or 397226 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 45.

The spelling of 266391472320 in words is "two hundred sixty-six billion, three hundred ninety-one million, four hundred seventy-two thousand, three hundred twenty".