26689355778 has 16 divisors (see below), whose sum is σ = 53978473440. Its totient is φ = 8796491616.

The previous prime is 26689355773. The next prime is 26689355801. The reversal of 26689355778 is 87755398662.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26689355773) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24989500 + ... + 24990567.

It is an arithmetic number, because the mean of its divisors is an integer number (3373654590).

Almost surely, 2^26689355778 is an apocalyptic number.

26689355778 is an abundant number, since it is smaller than the sum of its proper divisors (27289117662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26689355778 is a wasteful number, since it uses less digits than its factorization.

26689355778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49980161.

The product of its digits is 152409600, while the sum is 66.

The spelling of 26689355778 in words is "twenty-six billion, six hundred eighty-nine million, three hundred fifty-five thousand, seven hundred seventy-eight".