26693250991 has 4 divisors (see below), whose sum is σ = 29119910184. Its totient is φ = 24266591800.

The previous prime is 26693250989. The next prime is 26693251001. The reversal of 26693250991 is 19905239662.

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

It is not a de Polignac number, because 26693250991 - 2¹ = 26693250989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26693250901) 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, 1213329580 + ... + 1213329601.

It is an arithmetic number, because the mean of its divisors is an integer number (7279977546).

Almost surely, 2^26693250991 is an apocalyptic number.

26693250991 is a deficient number, since it is larger than the sum of its proper divisors (2426659193).

26693250991 is a wasteful number, since it uses less digits than its factorization.

26693250991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2426659192.

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

The spelling of 26693250991 in words is "twenty-six billion, six hundred ninety-three million, two hundred fifty thousand, nine hundred ninety-one".