26501515265240 has 128 divisors (see below), whose sum is σ = 61049607413760. Its totient is φ = 10349110017024.

The previous prime is 26501515265191. The next prime is 26501515265311. The reversal of 26501515265240 is 4256251510562.

It is a super-2 number, since 2×26501515265240² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26501515265191 and 26501515265200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1341635204 + ... + 1341654956.

It is an arithmetic number, because the mean of its divisors is an integer number (476950057920).

Almost surely, 2^{26501515265240} is an apocalyptic number.

26501515265240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26501515265240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30524803706880).

26501515265240 is an abundant number, since it is smaller than the sum of its proper divisors (34548092148520).

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

26501515265240 is a wasteful number, since it uses less digits than its factorization.

26501515265240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21561 (or 21557 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 44.

The spelling of 26501515265240 in words is "twenty-six trillion, five hundred one billion, five hundred fifteen million, two hundred sixty-five thousand, two hundred forty".