266220557278 has 8 divisors (see below), whose sum is σ = 430048592568. Its totient is φ = 122871026424.

The previous prime is 266220557249. The next prime is 266220557279. The reversal of 266220557278 is 872755022662.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266220557279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5119626076 + ... + 5119626127.

It is an arithmetic number, because the mean of its divisors is an integer number (53756074071).

Almost surely, 2^266220557278 is an apocalyptic number.

266220557278 is a deficient number, since it is larger than the sum of its proper divisors (163828035290).

266220557278 is a wasteful number, since it uses less digits than its factorization.

266220557278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10239252218.

The product of its (nonzero) digits is 5644800, while the sum is 52.

The spelling of 266220557278 in words is "two hundred sixty-six billion, two hundred twenty million, five hundred fifty-seven thousand, two hundred seventy-eight".