49999997857 has 2 divisors, whose sum is σ = 49999997858. Its totient is φ = 49999997856.

The previous prime is 49999997849. The next prime is 49999997923. The reversal of 49999997857 is 75879999994.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47943919521 + 2056078336 = 218961^2 + 45344^2 .

It is a cyclic number.

It is not a de Polignac number, because 49999997857 - 2³ = 49999997849 is a prime.

It is not a weakly prime, because it can be changed into another prime (49999991857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24999998928 + 24999998929.

It is an arithmetic number, because the mean of its divisors is an integer number (24999998929).

Almost surely, 2^49999997857 is an apocalyptic number.

It is an amenable number.

49999997857 is a deficient number, since it is larger than the sum of its proper divisors (1).

49999997857 is an equidigital number, since it uses as much as digits as its factorization.

49999997857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4166497440, while the sum is 85.

The spelling of 49999997857 in words is "forty-nine billion, nine hundred ninety-nine million, nine hundred ninety-seven thousand, eight hundred fifty-seven".