26491046749 has 2 divisors, whose sum is σ = 26491046750. Its totient is φ = 26491046748.

The previous prime is 26491046741. The next prime is 26491046809. The reversal of 26491046749 is 94764019462.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26339017849 + 152028900 = 162293^2 + 12330^2 .

It is a cyclic number.

It is not a de Polignac number, because 26491046749 - 2³ = 26491046741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 26491046696 and 26491046705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26491046741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13245523374 + 13245523375.

It is an arithmetic number, because the mean of its divisors is an integer number (13245523375).

Almost surely, 2^26491046749 is an apocalyptic number.

It is an amenable number.

26491046749 is a deficient number, since it is larger than the sum of its proper divisors (1).

26491046749 is an equidigital number, since it uses as much as digits as its factorization.

26491046749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 26491046749 in words is "twenty-six billion, four hundred ninety-one million, forty-six thousand, seven hundred forty-nine".