266398101238680 has 96 divisors (see below), whose sum is σ = 865802699236800. Its totient is φ = 71038765851648.

The previous prime is 266398101238663. The next prime is 266398101238681. The reversal of 266398101238680 is 86832101893662.

It is a happy number.

266398101238680 is a `hidden beast` number, since 2 + 6 + 6 + 398 + 1 + 0 + 1 + 238 + 6 + 8 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266398101238681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31861681 + ... + 39344159.

It is an arithmetic number, because the mean of its divisors is an integer number (9018778117050).

Almost surely, 2^{266398101238680} is an apocalyptic number.

266398101238680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

266398101238680 is an abundant number, since it is smaller than the sum of its proper divisors (599404597998120).

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

266398101238680 is a wasteful number, since it uses less digits than its factorization.

266398101238680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7581393 (or 7581386 counting only the distinct ones).

The product of its (nonzero) digits is 35831808, while the sum is 63.

The spelling of 266398101238680 in words is "two hundred sixty-six trillion, three hundred ninety-eight billion, one hundred one million, two hundred thirty-eight thousand, six hundred eighty".