26256557513 has 4 divisors (see below), whose sum is σ = 26278678800. Its totient is φ = 26234436228.

The previous prime is 26256557507. The next prime is 26256557519. The reversal of 26256557513 is 31575565262.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31575565262 = 2 ⋅15787782631.

It is an interprime number because it is at equal distance from previous prime (26256557507) and next prime (26256557519).

It is a cyclic number.

It is not a de Polignac number, because 26256557513 - 2¹⁸ = 26256295369 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 11058863 + ... + 11061236.

It is an arithmetic number, because the mean of its divisors is an integer number (6569669700).

Almost surely, 2^26256557513 is an apocalyptic number.

It is an amenable number.

26256557513 is a deficient number, since it is larger than the sum of its proper divisors (22121287).

26256557513 is a wasteful number, since it uses less digits than its factorization.

26256557513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22121286.

The product of its digits is 1890000, while the sum is 47.

The spelling of 26256557513 in words is "twenty-six billion, two hundred fifty-six million, five hundred fifty-seven thousand, five hundred thirteen".