26991861263 has 8 divisors (see below), whose sum is σ = 28415944320. Its totient is φ = 25568124120.

The previous prime is 26991861227. The next prime is 26991861313. The reversal of 26991861263 is 36216819962.

It is a Cunningham number, because it is equal to 164292²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26991861263 - 2⁸ = 26991861007 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 (26991861863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82148 + ... + 246438.

It is an arithmetic number, because the mean of its divisors is an integer number (3551993040).

Almost surely, 2^26991861263 is an apocalyptic number.

26991861263 is a deficient number, since it is larger than the sum of its proper divisors (1424083057).

26991861263 is a wasteful number, since it uses less digits than its factorization.

26991861263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172957.

The product of its digits is 1679616, while the sum is 53.

The spelling of 26991861263 in words is "twenty-six billion, nine hundred ninety-one million, eight hundred sixty-one thousand, two hundred sixty-three".