124778684813 has 2 divisors, whose sum is σ = 124778684814. Its totient is φ = 124778684812.

The previous prime is 124778684809. The next prime is 124778684879. The reversal of 124778684813 is 318486877421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121997915524 + 2780769289 = 349282^2 + 52733^2 .

It is a cyclic number.

It is not a de Polignac number, because 124778684813 - 2² = 124778684809 is a prime.

It is a super-3 number, since 3×124778684813³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124778684113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62389342406 + 62389342407.

It is an arithmetic number, because the mean of its divisors is an integer number (62389342407).

Almost surely, 2^124778684813 is an apocalyptic number.

It is an amenable number.

124778684813 is a deficient number, since it is larger than the sum of its proper divisors (1).

124778684813 is an equidigital number, since it uses as much as digits as its factorization.

124778684813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14450688, while the sum is 59.

The spelling of 124778684813 in words is "one hundred twenty-four billion, seven hundred seventy-eight million, six hundred eighty-four thousand, eight hundred thirteen".