26643710540 has 24 divisors (see below), whose sum is σ = 56869037232. Its totient is φ = 10482770880.

The previous prime is 26643710539. The next prime is 26643710567. The reversal of 26643710540 is 4501734662.

It is a happy number.

It is a super-2 number, since 2×26643710540² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26643710494 and 26643710503.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10918334 + ... + 10920773.

It is an arithmetic number, because the mean of its divisors is an integer number (2369543218).

Almost surely, 2^26643710540 is an apocalyptic number.

26643710540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26643710540 is an abundant number, since it is smaller than the sum of its proper divisors (30225326692).

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

26643710540 is a wasteful number, since it uses less digits than its factorization.

26643710540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21839177 (or 21839175 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The spelling of 26643710540 in words is "twenty-six billion, six hundred forty-three million, seven hundred ten thousand, five hundred forty".