124541681665 has 4 divisors (see below), whose sum is σ = 149450018004. Its totient is φ = 99633345328.

The previous prime is 124541681659. The next prime is 124541681729. The reversal of 124541681665 is 566186145421.

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 34315339536 + 90226342129 = 185244^2 + 300377^2 .

It is a cyclic number.

It is not a de Polignac number, because 124541681665 - 2⁹ = 124541681153 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

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, 12454168162 + ... + 12454168171.

It is an arithmetic number, because the mean of its divisors is an integer number (37362504501).

Almost surely, 2^124541681665 is an apocalyptic number.

It is an amenable number.

124541681665 is a deficient number, since it is larger than the sum of its proper divisors (24908336339).

124541681665 is an equidigital number, since it uses as much as digits as its factorization.

124541681665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24908336338.

The product of its digits is 1382400, while the sum is 49.

The spelling of 124541681665 in words is "one hundred twenty-four billion, five hundred forty-one million, six hundred eighty-one thousand, six hundred sixty-five".