165972265 has 8 divisors (see below), whose sum is σ = 199455048. Its totient is φ = 132585600.

The previous prime is 165972259. The next prime is 165972281. The reversal of 165972265 is 562279561.

It can be written as a sum of positive squares in 4 ways, for example, as 11417641 + 154554624 = 3379^2 + 12432^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-165972265 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20172 + ... + 27181.

It is an arithmetic number, because the mean of its divisors is an integer number (24931881).

Almost surely, 2^165972265 is an apocalyptic number.

It is an amenable number.

165972265 is a deficient number, since it is larger than the sum of its proper divisors (33482783).

165972265 is an equidigital number, since it uses as much as digits as its factorization.

165972265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48059.

The product of its digits is 226800, while the sum is 43.

The square root of 165972265 is about 12883.0223550221. The cubic root of 165972265 is about 549.5558563115. Note that the first 3 decimals are identical.

The spelling of 165972265 in words is "one hundred sixty-five million, nine hundred seventy-two thousand, two hundred sixty-five".