125556661313 has 8 divisors (see below), whose sum is σ = 128849956200. Its totient is φ = 122274363520.

The previous prime is 125556661301. The next prime is 125556661343. The reversal of 125556661313 is 313166655521.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 319944769 + 125236716544 = 17887^2 + 353888^2 .

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 125556661313 - 2¹⁰ = 125556660289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125556661343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2726138 + ... + 2771811.

It is an arithmetic number, because the mean of its divisors is an integer number (16106244525).

Almost surely, 2^125556661313 is an apocalyptic number.

It is an amenable number.

125556661313 is a deficient number, since it is larger than the sum of its proper divisors (3293294887).

125556661313 is an equidigital number, since it uses as much as digits as its factorization.

125556661313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5498547.

The product of its digits is 486000, while the sum is 44.

The spelling of 125556661313 in words is "one hundred twenty-five billion, five hundred fifty-six million, six hundred sixty-one thousand, three hundred thirteen".