266354666556660 has 288 divisors, whose sum is σ = 893528066471040. Its totient is φ = 63681848524800.

The previous prime is 266354666556653. The next prime is 266354666556673. The reversal of 266354666556660 is 66655666453662.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2371989796 + ... + 2372102084.

It is an arithmetic number, because the mean of its divisors is an integer number (3102528008580).

Almost surely, 2^{266354666556660} is an apocalyptic number.

266354666556660 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 266354666556660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446764033235520).

266354666556660 is an abundant number, since it is smaller than the sum of its proper divisors (627173399914380).

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

266354666556660 is a wasteful number, since it uses less digits than its factorization.

266354666556660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128799 (or 128794 counting only the distinct ones).

The product of its (nonzero) digits is 5038848000, while the sum is 72.

The spelling of 266354666556660 in words is "two hundred sixty-six trillion, three hundred fifty-four billion, six hundred sixty-six million, five hundred fifty-six thousand, six hundred sixty".