49697985817 has 2 divisors, whose sum is σ = 49697985818. Its totient is φ = 49697985816.

The previous prime is 49697985769. The next prime is 49697985847. The reversal of 49697985817 is 71858979694.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38328242176 + 11369743641 = 195776^2 + 106629^2 .

It is a cyclic number.

It is not a de Polignac number, because 49697985817 - 2¹⁵ = 49697953049 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 49697985817.

It is not a weakly prime, because it can be changed into another prime (49697985847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24848992908 + 24848992909.

It is an arithmetic number, because the mean of its divisors is an integer number (24848992909).

Almost surely, 2^49697985817 is an apocalyptic number.

It is an amenable number.

49697985817 is a deficient number, since it is larger than the sum of its proper divisors (1).

49697985817 is an equidigital number, since it uses as much as digits as its factorization.

49697985817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 274337280, while the sum is 73.

The spelling of 49697985817 in words is "forty-nine billion, six hundred ninety-seven million, nine hundred eighty-five thousand, eight hundred seventeen".