2148631725665 has 8 divisors (see below), whose sum is σ = 2582306555688. Its totient is φ = 1716273057280.

The previous prime is 2148631725659. The next prime is 2148631725707. The reversal of 2148631725665 is 5665271368412.

It can be written as a sum of positive squares in 4 ways, for example, as 293936381281 + 1854695344384 = 542159^2 + 1361872^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2148631725665 - 2⁴ = 2148631725649 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2148631725665.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 329036816 + ... + 329043345.

It is an arithmetic number, because the mean of its divisors is an integer number (322788319461).

Almost surely, 2^{2148631725665} is an apocalyptic number.

It is an amenable number.

2148631725665 is a deficient number, since it is larger than the sum of its proper divisors (433674830023).

2148631725665 is an equidigital number, since it uses as much as digits as its factorization.

2148631725665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658080819.

The product of its digits is 14515200, while the sum is 56.

The spelling of 2148631725665 in words is "two trillion, one hundred forty-eight billion, six hundred thirty-one million, seven hundred twenty-five thousand, six hundred sixty-five".