266799536640 has 1120 divisors, whose sum is σ = 1181184149376. Its totient is φ = 56255938560.

The previous prime is 266799536623. The next prime is 266799536669. The reversal of 266799536640 is 46635997662.

It is a happy number.

266799536640 is a `hidden beast` number, since 2 + 6 + 6 + 7 + 99 + 536 + 6 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1120).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 169827055 + ... + 169828625.

Almost surely, 2^266799536640 is an apocalyptic number.

266799536640 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 266799536640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (590592074688).

266799536640 is an abundant number, since it is smaller than the sum of its proper divisors (914384612736).

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

266799536640 is an equidigital number, since it uses as much as digits as its factorization.

266799536640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632 (or 1601 counting only the distinct ones).

The product of its (nonzero) digits is 88179840, while the sum is 63.

The spelling of 266799536640 in words is "two hundred sixty-six billion, seven hundred ninety-nine million, five hundred thirty-six thousand, six hundred forty".