125611817117 has 2 divisors, whose sum is σ = 125611817118. Its totient is φ = 125611817116.

The previous prime is 125611817099. The next prime is 125611817161. The reversal of 125611817117 is 711718116521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118603783321 + 7008033796 = 344389^2 + 83714^2 .

It is an emirp because it is prime and its reverse (711718116521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 125611817117 - 2¹⁰ = 125611816093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125611417117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62805908558 + 62805908559.

It is an arithmetic number, because the mean of its divisors is an integer number (62805908559).

Almost surely, 2^125611817117 is an apocalyptic number.

It is an amenable number.

125611817117 is a deficient number, since it is larger than the sum of its proper divisors (1).

125611817117 is an equidigital number, since it uses as much as digits as its factorization.

125611817117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 41.

The spelling of 125611817117 in words is "one hundred twenty-five billion, six hundred eleven million, eight hundred seventeen thousand, one hundred seventeen".