49821756389 has 2 divisors, whose sum is σ = 49821756390. Its totient is φ = 49821756388.

The previous prime is 49821756379. The next prime is 49821756407. The reversal of 49821756389 is 98365712894.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47368040164 + 2453716225 = 217642^2 + 49535^2 .

It is a cyclic number.

It is not a de Polignac number, because 49821756389 - 2⁸ = 49821756133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (49821756329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24910878194 + 24910878195.

It is an arithmetic number, because the mean of its divisors is an integer number (24910878195).

Almost surely, 2^49821756389 is an apocalyptic number.

It is an amenable number.

49821756389 is a deficient number, since it is larger than the sum of its proper divisors (1).

49821756389 is an equidigital number, since it uses as much as digits as its factorization.

49821756389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26127360, while the sum is 62.

The spelling of 49821756389 in words is "forty-nine billion, eight hundred twenty-one million, seven hundred fifty-six thousand, three hundred eighty-nine".