26506533493 has 4 divisors (see below), whose sum is σ = 28916218368. Its totient is φ = 24096848620.

The previous prime is 26506533479. The next prime is 26506533511. The reversal of 26506533493 is 39433560562.

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 26506533493 - 2²⁵ = 26472979061 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 (26506530493) 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, 1204842421 + ... + 1204842442.

It is an arithmetic number, because the mean of its divisors is an integer number (7229054592).

Almost surely, 2^26506533493 is an apocalyptic number.

It is an amenable number.

26506533493 is a deficient number, since it is larger than the sum of its proper divisors (2409684875).

26506533493 is a wasteful number, since it uses less digits than its factorization.

26506533493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2409684874.

The product of its (nonzero) digits is 1749600, while the sum is 46.

The spelling of 26506533493 in words is "twenty-six billion, five hundred six million, five hundred thirty-three thousand, four hundred ninety-three".