124399681345 has 4 divisors (see below), whose sum is σ = 149279617620. Its totient is φ = 99519745072.

The previous prime is 124399681337. The next prime is 124399681447. The reversal of 124399681345 is 543186993421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 543186993421 = 1601 ⋅339279821.

It can be written as a sum of positive squares in 2 ways, for example, as 12774198529 + 111625482816 = 113023^2 + 334104^2 .

It is a cyclic number.

It is not a de Polignac number, because 124399681345 - 2³ = 124399681337 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12439968130 + ... + 12439968139.

It is an arithmetic number, because the mean of its divisors is an integer number (37319904405).

Almost surely, 2^124399681345 is an apocalyptic number.

It is an amenable number.

124399681345 is a deficient number, since it is larger than the sum of its proper divisors (24879936275).

124399681345 is an equidigital number, since it uses as much as digits as its factorization.

124399681345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24879936274.

The product of its digits is 5598720, while the sum is 55.

The spelling of 124399681345 in words is "one hundred twenty-four billion, three hundred ninety-nine million, six hundred eighty-one thousand, three hundred forty-five".