266401876620 has 48 divisors (see below), whose sum is σ = 813736643328. Its totient is φ = 64582272960.

The previous prime is 266401876571. The next prime is 266401876639. The reversal of 266401876620 is 26678104662.

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 a self number, because there is not a number n which added to its sum of digits gives 266401876620.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 201818944 + ... + 201820263.

It is an arithmetic number, because the mean of its divisors is an integer number (16952846736).

Almost surely, 2^266401876620 is an apocalyptic number.

266401876620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266401876620 is an abundant number, since it is smaller than the sum of its proper divisors (547334766708).

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

266401876620 is a wasteful number, since it uses less digits than its factorization.

266401876620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403639230 (or 403639228 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 48.

The spelling of 266401876620 in words is "two hundred sixty-six billion, four hundred one million, eight hundred seventy-six thousand, six hundred twenty".