266121767506 has 32 divisors (see below), whose sum is σ = 485937107712. Its totient is φ = 106700444160.

The previous prime is 266121767479. The next prime is 266121767507. The reversal of 266121767506 is 605767121662.

It is a self number, because there is not a number n which added to its sum of digits gives 266121767506.

It is not an unprimeable number, because it can be changed into a prime (266121767507) 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 15 ways as a sum of consecutive naturals, for example, 3308035 + ... + 3387526.

It is an arithmetic number, because the mean of its divisors is an integer number (15185534616).

Almost surely, 2^266121767506 is an apocalyptic number.

266121767506 is a deficient number, since it is larger than the sum of its proper divisors (219815340206).

266121767506 is a wasteful number, since it uses less digits than its factorization.

266121767506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6695754.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 266121767506 in words is "two hundred sixty-six billion, one hundred twenty-one million, seven hundred sixty-seven thousand, five hundred six".