125285557849 has 27 divisors (see below), whose sum is σ = 136288383007. Its totient is φ = 115146459584.

The previous prime is 125285557847. The next prime is 125285557861. The reversal of 125285557849 is 948755582521.

It is a happy number.

The square root of 125285557849 is 353957.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 97540659225 + 27744898624 = 312315^2 + 166568^2 .

It is not a de Polignac number, because 125285557849 - 2¹ = 125285557847 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125285557847) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 282811422 + ... + 282811864.

Almost surely, 2^125285557849 is an apocalyptic number.

125285557849 is the 353957-th square number.

125285557849 is the 176979-th centered octagonal number.

It is an amenable number.

125285557849 is a deficient number, since it is larger than the sum of its proper divisors (11002825158).

125285557849 is an frugal number, since it uses more digits than its factorization.

125285557849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1014 (or 507 counting only the distinct ones).

The product of its digits is 40320000, while the sum is 61.

The spelling of 125285557849 in words is "one hundred twenty-five billion, two hundred eighty-five million, five hundred fifty-seven thousand, eight hundred forty-nine".