266499486720 has 440 divisors, whose sum is σ = 961300987944. Its totient is φ = 70596624384.

The previous prime is 266499486719. The next prime is 266499486739. The reversal of 266499486720 is 27684994662.

266499486720 is a `hidden beast` number, since 2 + 6 + 64 + 99 + 486 + 7 + 2 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7817389056 + 258682097664 = 88416^2 + 508608^2 .

It is a congruent number.

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, 65108994 + ... + 65113086.

Almost surely, 2^266499486720 is an apocalyptic number.

266499486720 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 266499486720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (480650493972).

266499486720 is an abundant number, since it is smaller than the sum of its proper divisors (694801501224).

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

266499486720 is a wasteful number, since it uses less digits than its factorization.

266499486720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4287 (or 4260 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 63.

The spelling of 266499486720 in words is "two hundred sixty-six billion, four hundred ninety-nine million, four hundred eighty-six thousand, seven hundred twenty".