26391578678 has 4 divisors (see below), whose sum is σ = 39587368020. Its totient is φ = 13195789338.

The previous prime is 26391578677. The next prime is 26391578693. The reversal of 26391578678 is 87687519362.

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

It is a self number, because there is not a number n which added to its sum of digits gives 26391578678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26391578671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6597894668 + ... + 6597894671.

It is an arithmetic number, because the mean of its divisors is an integer number (9896842005).

Almost surely, 2^26391578678 is an apocalyptic number.

26391578678 is a deficient number, since it is larger than the sum of its proper divisors (13195789342).

26391578678 is a wasteful number, since it uses less digits than its factorization.

26391578678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13195789341.

The product of its digits is 30481920, while the sum is 62.

The spelling of 26391578678 in words is "twenty-six billion, three hundred ninety-one million, five hundred seventy-eight thousand, six hundred seventy-eight".