26949957493 has 2 divisors, whose sum is σ = 26949957494. Its totient is φ = 26949957492.

The previous prime is 26949957481. The next prime is 26949957667. The reversal of 26949957493 is 39475994962.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26890096324 + 59861169 = 163982^2 + 7737^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-26949957493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26949957413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13474978746 + 13474978747.

It is an arithmetic number, because the mean of its divisors is an integer number (13474978747).

Almost surely, 2^26949957493 is an apocalyptic number.

It is an amenable number.

26949957493 is a deficient number, since it is larger than the sum of its proper divisors (1).

26949957493 is an equidigital number, since it uses as much as digits as its factorization.

26949957493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 132269760, while the sum is 67.

The spelling of 26949957493 in words is "twenty-six billion, nine hundred forty-nine million, nine hundred fifty-seven thousand, four hundred ninety-three".