125516399585 has 4 divisors (see below), whose sum is σ = 150619679508. Its totient is φ = 100413119664.

The previous prime is 125516399581. The next prime is 125516399599. The reversal of 125516399585 is 585993615521.

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 30950309329 + 94566090256 = 175927^2 + 307516^2 .

It is a cyclic number.

It is not a de Polignac number, because 125516399585 - 2² = 125516399581 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125516399581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12551639954 + ... + 12551639963.

It is an arithmetic number, because the mean of its divisors is an integer number (37654919877).

Almost surely, 2^125516399585 is an apocalyptic number.

It is an amenable number.

125516399585 is a deficient number, since it is larger than the sum of its proper divisors (25103279923).

125516399585 is an equidigital number, since it uses as much as digits as its factorization.

125516399585 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25103279922.

The product of its digits is 14580000, while the sum is 59.

The spelling of 125516399585 in words is "one hundred twenty-five billion, five hundred sixteen million, three hundred ninety-nine thousand, five hundred eighty-five".