26278009906 has 4 divisors (see below), whose sum is σ = 39417014862. Its totient is φ = 13139004952.

The previous prime is 26278009897. The next prime is 26278009957. The reversal of 26278009906 is 60990087262.

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

It can be written as a sum of positive squares in only one way, i.e., 17117797225 + 9160212681 = 130835^2 + 95709^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 26278009906.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6569502475 + ... + 6569502478.

Almost surely, 2^26278009906 is an apocalyptic number.

26278009906 is a deficient number, since it is larger than the sum of its proper divisors (13139004956).

26278009906 is a wasteful number, since it uses less digits than its factorization.

26278009906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13139004955.

The product of its (nonzero) digits is 653184, while the sum is 49.

The spelling of 26278009906 in words is "twenty-six billion, two hundred seventy-eight million, nine thousand, nine hundred six".