26256557515 has 16 divisors (see below), whose sum is σ = 32604223680. Its totient is φ = 20274782080.

The previous prime is 26256557507. The next prime is 26256557519. The reversal of 26256557515 is 51575565262.

It is not a de Polignac number, because 26256557515 - 2³ = 26256557507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26256557519) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 485745 + ... + 537085.

It is an arithmetic number, because the mean of its divisors is an integer number (2037763980).

Almost surely, 2^26256557515 is an apocalyptic number.

26256557515 is a deficient number, since it is larger than the sum of its proper divisors (6347666165).

26256557515 is a wasteful number, since it uses less digits than its factorization.

26256557515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54902.

The product of its digits is 3150000, while the sum is 49.

The spelling of 26256557515 in words is "twenty-six billion, two hundred fifty-six million, five hundred fifty-seven thousand, five hundred fifteen".