266539505040 has 160 divisors (see below), whose sum is σ = 926504092800. Its totient is φ = 70425054720.

The previous prime is 266539504997. The next prime is 266539505069. The reversal of 266539505040 is 40505935662.

266539505040 is a `hidden beast` number, since 2 + 6 + 6 + 53 + 95 + 0 + 504 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 330606 + ... + 801485.

It is an arithmetic number, because the mean of its divisors is an integer number (5790650580).

Almost surely, 2^266539505040 is an apocalyptic number.

266539505040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266539505040 is an abundant number, since it is smaller than the sum of its proper divisors (659964587760).

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

266539505040 is a wasteful number, since it uses less digits than its factorization.

266539505040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1132222 (or 1132210 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 45.

The spelling of 266539505040 in words is "two hundred sixty-six billion, five hundred thirty-nine million, five hundred five thousand, forty".