125319216817 has 4 divisors (see below), whose sum is σ = 125593438756. Its totient is φ = 125044994880.

The previous prime is 125319216793. The next prime is 125319216871. The reversal of 125319216817 is 718612913521.

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 72492331536 + 52826885281 = 269244^2 + 229841^2 .

It is a cyclic number.

It is not a de Polignac number, because 125319216817 - 2⁷ = 125319216689 is a prime.

It is a super-2 number, since 2×125319216817² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125319216887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137110284 + ... + 137111197.

It is an arithmetic number, because the mean of its divisors is an integer number (31398359689).

Almost surely, 2^125319216817 is an apocalyptic number.

It is an amenable number.

125319216817 is a deficient number, since it is larger than the sum of its proper divisors (274221939).

125319216817 is an equidigital number, since it uses as much as digits as its factorization.

125319216817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274221938.

The product of its digits is 181440, while the sum is 46.

The spelling of 125319216817 in words is "one hundred twenty-five billion, three hundred nineteen million, two hundred sixteen thousand, eight hundred seventeen".