125321918185 has 4 divisors (see below), whose sum is σ = 150386301828. Its totient is φ = 100257534544.

The previous prime is 125321918179. The next prime is 125321918209. The reversal of 125321918185 is 581819123521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 581819123521 = 293 ⋅1985730797.

It can be written as a sum of positive squares in 2 ways, for example, as 82200903849 + 43121014336 = 286707^2 + 207656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-125321918185 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12532191814 + ... + 12532191823.

It is an arithmetic number, because the mean of its divisors is an integer number (37596575457).

Almost surely, 2^125321918185 is an apocalyptic number.

It is an amenable number.

125321918185 is a deficient number, since it is larger than the sum of its proper divisors (25064383643).

125321918185 is an equidigital number, since it uses as much as digits as its factorization.

125321918185 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25064383642.

The product of its digits is 172800, while the sum is 46.

The spelling of 125321918185 in words is "one hundred twenty-five billion, three hundred twenty-one million, nine hundred eighteen thousand, one hundred eighty-five".