26666868520 has 16 divisors (see below), whose sum is σ = 60000454260. Its totient is φ = 10666747392.

The previous prime is 26666868517. The next prime is 26666868533. The reversal of 26666868520 is 2586866662.

It can be written as a sum of positive squares in 2 ways, for example, as 25766028324 + 900840196 = 160518^2 + 30014^2 .

It is a super-2 number, since 2×26666868520² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 333335817 + ... + 333335896.

Almost surely, 2^26666868520 is an apocalyptic number.

26666868520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26666868520 is an abundant number, since it is smaller than the sum of its proper divisors (33333585740).

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

26666868520 is a wasteful number, since it uses less digits than its factorization.

26666868520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666671724 (or 666671720 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 55.

The spelling of 26666868520 in words is "twenty-six billion, six hundred sixty-six million, eight hundred sixty-eight thousand, five hundred twenty".