165609972503425 has 6 divisors (see below), whose sum is σ = 205356365904278. Its totient is φ = 132487978002720.

The previous prime is 165609972503387. The next prime is 165609972503447. The reversal of 165609972503425 is 524305279906561.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 23051435018481 + 142558537484944 = 4801191^2 + 11939788^2 .

It is not a de Polignac number, because 165609972503425 - 2⁴⁷ = 24872484148097 is a prime.

It is a Duffinian 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, 3312199450044 + ... + 3312199450093.

Almost surely, 2^{165609972503425} is an apocalyptic number.

It is an amenable number.

165609972503425 is a deficient number, since it is larger than the sum of its proper divisors (39746393400853).

165609972503425 is an equidigital number, since it uses as much as digits as its factorization.

165609972503425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6624398900147 (or 6624398900142 counting only the distinct ones).

The product of its (nonzero) digits is 122472000, while the sum is 64.

The spelling of 165609972503425 in words is "one hundred sixty-five trillion, six hundred nine billion, nine hundred seventy-two million, five hundred three thousand, four hundred twenty-five".