26506610465 has 4 divisors (see below), whose sum is σ = 31807932564. Its totient is φ = 21205288368.

The previous prime is 26506610437. The next prime is 26506610509. The reversal of 26506610465 is 56401660562.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18321246736 + 8185363729 = 135356^2 + 90473^2 .

It is a cyclic number.

It is not a de Polignac number, because 26506610465 - 2¹² = 26506606369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2650661042 + ... + 2650661051.

It is an arithmetic number, because the mean of its divisors is an integer number (7951983141).

Almost surely, 2^26506610465 is an apocalyptic number.

It is an amenable number.

26506610465 is a deficient number, since it is larger than the sum of its proper divisors (5301322099).

26506610465 is an equidigital number, since it uses as much as digits as its factorization.

26506610465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5301322098.

The product of its (nonzero) digits is 259200, while the sum is 41.

The spelling of 26506610465 in words is "twenty-six billion, five hundred six million, six hundred ten thousand, four hundred sixty-five".