26513520516391 has 4 divisors (see below), whose sum is σ = 26518137189472. Its totient is φ = 26508903843312.

The previous prime is 26513520516347. The next prime is 26513520516401. The reversal of 26513520516391 is 19361502531562.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26513520516391 - 2²¹ = 26513518419239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26513520516491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2308327926 + ... + 2308339411.

It is an arithmetic number, because the mean of its divisors is an integer number (6629534297368).

Almost surely, 2^{26513520516391} is an apocalyptic number.

26513520516391 is a deficient number, since it is larger than the sum of its proper divisors (4616673081).

26513520516391 is an equidigital number, since it uses as much as digits as its factorization.

26513520516391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4616673080.

The product of its (nonzero) digits is 1458000, while the sum is 49.

The spelling of 26513520516391 in words is "twenty-six trillion, five hundred thirteen billion, five hundred twenty million, five hundred sixteen thousand, three hundred ninety-one".