26656778865 has 16 divisors (see below), whose sum is σ = 42722064000. Its totient is φ = 14193209472.

The previous prime is 26656778839. The next prime is 26656778873. The reversal of 26656778865 is 56887765662.

It is not a de Polignac number, because 26656778865 - 2¹² = 26656774769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26656778796 and 26656778805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1474420 + ... + 1492389.

It is an arithmetic number, because the mean of its divisors is an integer number (2670129000).

Almost surely, 2^26656778865 is an apocalyptic number.

It is an amenable number.

26656778865 is a deficient number, since it is larger than the sum of its proper divisors (16065285135).

26656778865 is a wasteful number, since it uses less digits than its factorization.

26656778865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2967416.

The product of its digits is 203212800, while the sum is 66.

The spelling of 26656778865 in words is "twenty-six billion, six hundred fifty-six million, seven hundred seventy-eight thousand, eight hundred sixty-five".