266942247138 has 126 divisors (see below), whose sum is σ = 698722473969. Its totient is φ = 76229757072.

The previous prime is 266942247133. The next prime is 266942247149. The reversal of 266942247138 is 831742249662.

It is a happy number.

266942247138 is a `hidden beast` number, since 2 + 66 + 94 + 22 + 471 + 3 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 257904512649 + 9037734489 = 507843^2 + 95067^2 .

It is a tau number, because it is divible by the number of its divisors (126).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=365337.

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

It is not an unprimeable number, because it can be changed into a prime (266942247133) 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 62 ways as a sum of consecutive naturals, for example, 138096420 + ... + 138098352.

Almost surely, 2^266942247138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266942247138

266942247138 is an abundant number, since it is smaller than the sum of its proper divisors (431780226831).

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

266942247138 is an frugal number, since it uses more digits than its factorization.

266942247138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3900 (or 1945 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The spelling of 266942247138 in words is "two hundred sixty-six billion, nine hundred forty-two million, two hundred forty-seven thousand, one hundred thirty-eight".