26515680499 has 16 divisors (see below), whose sum is σ = 33088861440. Its totient is φ = 20642600160.

The previous prime is 26515680497. The next prime is 26515680509. The reversal of 26515680499 is 99408651562.

It is not a de Polignac number, because 26515680499 - 2¹ = 26515680497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26515680491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73369 + ... + 241690.

It is an arithmetic number, because the mean of its divisors is an integer number (2068053840).

Almost surely, 2^26515680499 is an apocalyptic number.

26515680499 is a deficient number, since it is larger than the sum of its proper divisors (6573180941).

26515680499 is a wasteful number, since it uses less digits than its factorization.

26515680499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316170.

The product of its (nonzero) digits is 4665600, while the sum is 55.

The spelling of 26515680499 in words is "twenty-six billion, five hundred fifteen million, six hundred eighty thousand, four hundred ninety-nine".