125171161621519 has 4 divisors (see below), whose sum is σ = 134799712515496. Its totient is φ = 115542610727544.

The previous prime is 125171161621481. The next prime is 125171161621537. The reversal of 125171161621519 is 915126161171521.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 125171161621519 - 2⁷ = 125171161621391 is a prime.

It is a super-2 number, since 2×125171161621519² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125171161621579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4814275446969 + ... + 4814275446994.

It is an arithmetic number, because the mean of its divisors is an integer number (33699928128874).

Almost surely, 2^{125171161621519} is an apocalyptic number.

125171161621519 is a deficient number, since it is larger than the sum of its proper divisors (9628550893977).

125171161621519 is an equidigital number, since it uses as much as digits as its factorization.

125171161621519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9628550893976.

The product of its digits is 226800, while the sum is 49.

The spelling of 125171161621519 in words is "one hundred twenty-five trillion, one hundred seventy-one billion, one hundred sixty-one million, six hundred twenty-one thousand, five hundred nineteen".