266621562610560 has 640 divisors, whose sum is σ = 972790022160000. Its totient is φ = 69559310352384.

The previous prime is 266621562610549. The next prime is 266621562610567. The reversal of 266621562610560 is 65016265126662.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 266621562610497 and 266621562610506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266621562610567) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 6707609566 + ... + 6707649314.

It is an arithmetic number, because the mean of its divisors is an integer number (1519984409625).

Almost surely, 2^{266621562610560} is an apocalyptic number.

266621562610560 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 266621562610560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (486395011080000).

266621562610560 is an abundant number, since it is smaller than the sum of its proper divisors (706168459549440).

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

266621562610560 is a wasteful number, since it uses less digits than its factorization.

266621562610560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42580 (or 42559 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 54.

The spelling of 266621562610560 in words is "two hundred sixty-six trillion, six hundred twenty-one billion, five hundred sixty-two million, six hundred ten thousand, five hundred sixty".