26512136449 has 4 divisors (see below), whose sum is σ = 26769535936. Its totient is φ = 26254736964.

The previous prime is 26512136447. The next prime is 26512136461. The reversal of 26512136449 is 94463121562.

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.

It is a cyclic number.

It is not a de Polignac number, because 26512136449 - 2¹ = 26512136447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26512136447) 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, 128699589 + ... + 128699794.

It is an arithmetic number, because the mean of its divisors is an integer number (6692383984).

Almost surely, 2^26512136449 is an apocalyptic number.

It is an amenable number.

26512136449 is a deficient number, since it is larger than the sum of its proper divisors (257399487).

26512136449 is a wasteful number, since it uses less digits than its factorization.

26512136449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257399486.

The product of its digits is 311040, while the sum is 43.

The spelling of 26512136449 in words is "twenty-six billion, five hundred twelve million, one hundred thirty-six thousand, four hundred forty-nine".