125686619557 has 2 divisors, whose sum is σ = 125686619558. Its totient is φ = 125686619556.

The previous prime is 125686619489. The next prime is 125686619567. The reversal of 125686619557 is 755916686521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92388034116 + 33298585441 = 303954^2 + 182479^2 .

It is an emirp because it is prime and its reverse (755916686521) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125686619557 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 125686619495 and 125686619504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125686619567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62843309778 + 62843309779.

It is an arithmetic number, because the mean of its divisors is an integer number (62843309779).

Almost surely, 2^125686619557 is an apocalyptic number.

It is an amenable number.

125686619557 is a deficient number, since it is larger than the sum of its proper divisors (1).

125686619557 is an equidigital number, since it uses as much as digits as its factorization.

125686619557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216000, while the sum is 61.

The spelling of 125686619557 in words is "one hundred twenty-five billion, six hundred eighty-six million, six hundred nineteen thousand, five hundred fifty-seven".