26515256520 has 128 divisors (see below), whose sum is σ = 83860842240. Its totient is φ = 6693519360.

The previous prime is 26515256519. The next prime is 26515256569. The reversal of 26515256520 is 2565251562.

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 31 ways as a sum of consecutive naturals, for example, 218200 + ... + 317240.

It is an arithmetic number, because the mean of its divisors is an integer number (655162830).

Almost surely, 2^26515256520 is an apocalyptic number.

26515256520 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 26515256520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41930421120).

26515256520 is an abundant number, since it is smaller than the sum of its proper divisors (57345585720).

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

26515256520 is a wasteful number, since it uses less digits than its factorization.

26515256520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99175 (or 99171 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 26515256520 in words is "twenty-six billion, five hundred fifteen million, two hundred fifty-six thousand, five hundred twenty".