125447399618 has 18 divisors (see below), whose sum is σ = 196726229049. Its totient is φ = 59991072592.

The previous prime is 125447399591. The next prime is 125447399659. The reversal of 125447399618 is 816993744521.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 84397803169 + 41049596449 = 290513^2 + 202607^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=250447.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 11515118 + ... + 11526006.

Almost surely, 2^125447399618 is an apocalyptic number.

125447399618 is a deficient number, since it is larger than the sum of its proper divisors (71278829431).

125447399618 is an frugal number, since it uses more digits than its factorization.

125447399618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21826 (or 10914 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 59.

The spelling of 125447399618 in words is "one hundred twenty-five billion, four hundred forty-seven million, three hundred ninety-nine thousand, six hundred eighteen".