124778684809 has 2 divisors, whose sum is σ = 124778684810. Its totient is φ = 124778684808.

The previous prime is 124778684791. The next prime is 124778684813. The reversal of 124778684809 is 908486877421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 99901509184 + 24877175625 = 316072^2 + 157725^2 .

It is an emirp because it is prime and its reverse (908486877421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 124778684809 - 2¹⁷ = 124778553737 is a prime.

It is not a weakly prime, because it can be changed into another prime (124778684879) 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, 62389342404 + 62389342405.

It is an arithmetic number, because the mean of its divisors is an integer number (62389342405).

Almost surely, 2^124778684809 is an apocalyptic number.

It is an amenable number.

124778684809 is a deficient number, since it is larger than the sum of its proper divisors (1).

124778684809 is an equidigital number, since it uses as much as digits as its factorization.

124778684809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43352064, while the sum is 64.

The spelling of 124778684809 in words is "one hundred twenty-four billion, seven hundred seventy-eight million, six hundred eighty-four thousand, eight hundred nine".