26391953563 has 2 divisors, whose sum is σ = 26391953564. Its totient is φ = 26391953562.

The previous prime is 26391953551. The next prime is 26391953579. The reversal of 26391953563 is 36535919362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 26391953563 - 2⁹ = 26391953051 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26391953563.

It is not a weakly prime, because it can be changed into another prime (26391953513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13195976781 + 13195976782.

It is an arithmetic number, because the mean of its divisors is an integer number (13195976782).

Almost surely, 2^26391953563 is an apocalyptic number.

26391953563 is a deficient number, since it is larger than the sum of its proper divisors (1).

26391953563 is an equidigital number, since it uses as much as digits as its factorization.

26391953563 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3936600, while the sum is 52.

The spelling of 26391953563 in words is "twenty-six billion, three hundred ninety-one million, nine hundred fifty-three thousand, five hundred sixty-three".