87172424225 has 6 divisors (see below), whose sum is σ = 108093806070. Its totient is φ = 69737939360.

The previous prime is 87172424191. The next prime is 87172424281. The reversal of 87172424225 is 52242427178.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 11804605201 + 75367819024 = 108649^2 + 274532^2 .

It is not a de Polignac number, because 87172424225 - 2²² = 87168229921 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1743448460 + ... + 1743448509.

It is an arithmetic number, because the mean of its divisors is an integer number (18015634345).

Almost surely, 2^87172424225 is an apocalyptic number.

It is an amenable number.

87172424225 is a deficient number, since it is larger than the sum of its proper divisors (20921381845).

87172424225 is a wasteful number, since it uses less digits than its factorization.

87172424225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3486896979 (or 3486896974 counting only the distinct ones).

The product of its digits is 501760, while the sum is 44.

The spelling of 87172424225 in words is "eighty-seven billion, one hundred seventy-two million, four hundred twenty-four thousand, two hundred twenty-five".