266378280907 has 4 divisors (see below), whose sum is σ = 266444663760. Its totient is φ = 266311898056.

The previous prime is 266378280827. The next prime is 266378280923. The reversal of 266378280907 is 709082873662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266378280907 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266378280997) 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 3 ways as a sum of consecutive naturals, for example, 33185407 + ... + 33193432.

It is an arithmetic number, because the mean of its divisors is an integer number (66611165940).

Almost surely, 2^266378280907 is an apocalyptic number.

266378280907 is a deficient number, since it is larger than the sum of its proper divisors (66382853).

266378280907 is an equidigital number, since it uses as much as digits as its factorization.

266378280907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66382852.

The product of its (nonzero) digits is 12192768, while the sum is 58.

The spelling of 266378280907 in words is "two hundred sixty-six billion, three hundred seventy-eight million, two hundred eighty thousand, nine hundred seven".