125311643660165 has 8 divisors (see below), whose sum is σ = 150422652880920. Its totient is φ = 100216861268992.

The previous prime is 125311643660149. The next prime is 125311643660197. The reversal of 125311643660165 is 561066346113521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18201708191716 + 107109935468449 = 4266346^2 + 10349393^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 125311643660165 - 2⁴ = 125311643660149 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4056690404 + ... + 4056721293.

It is an arithmetic number, because the mean of its divisors is an integer number (18802831610115).

Almost surely, 2^{125311643660165} is an apocalyptic number.

It is an amenable number.

125311643660165 is a deficient number, since it is larger than the sum of its proper divisors (25111009220755).

125311643660165 is an equidigital number, since it uses as much as digits as its factorization.

125311643660165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8113414791.

The product of its (nonzero) digits is 2332800, while the sum is 50.

Adding to 125311643660165 its reverse (561066346113521), we get a palindrome (686377989773686).

The spelling of 125311643660165 in words is "one hundred twenty-five trillion, three hundred eleven billion, six hundred forty-three million, six hundred sixty thousand, one hundred sixty-five".