26980253749 has 4 divisors (see below), whose sum is σ = 27093142080. Its totient is φ = 26867365420.

The previous prime is 26980253731. The next prime is 26980253771. The reversal of 26980253749 is 94735208962.

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 a de Polignac number, because none of the positive numbers 2^k-26980253749 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 26980253749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26980253779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56443807 + ... + 56444284.

It is an arithmetic number, because the mean of its divisors is an integer number (6773285520).

Almost surely, 2^26980253749 is an apocalyptic number.

It is an amenable number.

26980253749 is a deficient number, since it is larger than the sum of its proper divisors (112888331).

26980253749 is a wasteful number, since it uses less digits than its factorization.

26980253749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112888330.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 26980253749 in words is "twenty-six billion, nine hundred eighty million, two hundred fifty-three thousand, seven hundred forty-nine".