266820275172 has 48 divisors (see below), whose sum is σ = 679818166272. Its totient is φ = 80778523680.

The previous prime is 266820275171. The next prime is 266820275173. The reversal of 266820275172 is 271572028662.

It is an interprime number because it is at equal distance from previous prime (266820275171) and next prime (266820275173).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (266820275171) 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, 810468 + ... + 1091099.

It is an arithmetic number, because the mean of its divisors is an integer number (14162878464).

Almost surely, 2^266820275172 is an apocalyptic number.

266820275172 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

266820275172 is an abundant number, since it is smaller than the sum of its proper divisors (412997891100).

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

266820275172 is a wasteful number, since it uses less digits than its factorization.

266820275172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1902648 (or 1902646 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 266820275172 in words is "two hundred sixty-six billion, eight hundred twenty million, two hundred seventy-five thousand, one hundred seventy-two".