125947171505 has 4 divisors (see below), whose sum is σ = 151136605812. Its totient is φ = 100757737200.

The previous prime is 125947171453. The next prime is 125947171523. The reversal of 125947171505 is 505171749521.

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 19727887936 + 106219283569 = 140456^2 + 325913^2 .

It is not a de Polignac number, because 125947171505 - 2⁸ = 125947171249 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 125947171505.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12594717146 + ... + 12594717155.

It is an arithmetic number, because the mean of its divisors is an integer number (37784151453).

Almost surely, 2^125947171505 is an apocalyptic number.

It is an amenable number.

125947171505 is a deficient number, since it is larger than the sum of its proper divisors (25189434307).

125947171505 is an equidigital number, since it uses as much as digits as its factorization.

125947171505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25189434306.

The product of its (nonzero) digits is 441000, while the sum is 47.

The spelling of 125947171505 in words is "one hundred twenty-five billion, nine hundred forty-seven million, one hundred seventy-one thousand, five hundred five".