266667513255648 has 192 divisors, whose sum is σ = 793750203267840. Its totient is φ = 87078693081600.

The previous prime is 266667513255643. The next prime is 266667513255677. The reversal of 266667513255648 is 846552315766662.

It is a super-2 number, since 2×266667513255648² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266667513255643) by changing a digit.

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, 2247718 + ... + 23203173.

It is an arithmetic number, because the mean of its divisors is an integer number (4134115642020).

Almost surely, 2^{266667513255648} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266667513255648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (396875101633920).

266667513255648 is an abundant number, since it is smaller than the sum of its proper divisors (527082690012192).

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

266667513255648 is a wasteful number, since it uses less digits than its factorization.

266667513255648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25451158 (or 25451144 counting only the distinct ones).

The product of its digits is 2612736000, while the sum is 72.

The spelling of 266667513255648 in words is "two hundred sixty-six trillion, six hundred sixty-seven billion, five hundred thirteen million, two hundred fifty-five thousand, six hundred forty-eight".