26156209993 has 4 divisors (see below), whose sum is σ = 26170848720. Its totient is φ = 26141571268.

The previous prime is 26156209991. The next prime is 26156210011. The reversal of 26156209993 is 39990265162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26156209993 - 2¹ = 26156209991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 26156209993.

It is not an unprimeable number, because it can be changed into a prime (26156209991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7316683 + ... + 7320256.

It is an arithmetic number, because the mean of its divisors is an integer number (6542712180).

Almost surely, 2^26156209993 is an apocalyptic number.

It is an amenable number.

26156209993 is a deficient number, since it is larger than the sum of its proper divisors (14638727).

26156209993 is a wasteful number, since it uses less digits than its factorization.

26156209993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14638726.

The product of its (nonzero) digits is 1574640, while the sum is 52.

The spelling of 26156209993 in words is "twenty-six billion, one hundred fifty-six million, two hundred nine thousand, nine hundred ninety-three".