124128639946081 has 4 divisors (see below), whose sum is σ = 126163535682964. Its totient is φ = 122093744209200.

The previous prime is 124128639946037. The next prime is 124128639946109. The reversal of 124128639946081 is 180649936821421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11393426422225 + 112735213523856 = 3375415^2 + 10617684^2 .

It is a cyclic number.

It is not a de Polignac number, because 124128639946081 - 2¹³ = 124128639937889 is a prime.

It is a super-2 number, since 2×124128639946081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (124128639943081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1017447868350 + ... + 1017447868471.

It is an arithmetic number, because the mean of its divisors is an integer number (31540883920741).

Almost surely, 2^{124128639946081} is an apocalyptic number.

It is an amenable number.

124128639946081 is a deficient number, since it is larger than the sum of its proper divisors (2034895736883).

124128639946081 is an equidigital number, since it uses as much as digits as its factorization.

124128639946081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034895736882.

The product of its (nonzero) digits is 35831808, while the sum is 64.

The spelling of 124128639946081 in words is "one hundred twenty-four trillion, one hundred twenty-eight billion, six hundred thirty-nine million, nine hundred forty-six thousand, eighty-one".