165825797 has 4 divisors (see below), whose sum is σ = 165876096. Its totient is φ = 165775500.

The previous prime is 165825757. The next prime is 165825809. The reversal of 165825797 is 797528561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 797528561 = 4787 ⋅166603.

It is a cyclic number.

It is not a de Polignac number, because 165825797 - 2¹⁰ = 165824773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165825707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19829 + ... + 26922.

It is an arithmetic number, because the mean of its divisors is an integer number (41469024).

Almost surely, 2^165825797 is an apocalyptic number.

It is an amenable number.

165825797 is a deficient number, since it is larger than the sum of its proper divisors (50299).

165825797 is an equidigital number, since it uses as much as digits as its factorization.

165825797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50298.

The product of its digits is 1058400, while the sum is 50.

The square root of 165825797 is about 12877.3365646783. The cubic root of 165825797 is about 549.3941505057.

The spelling of 165825797 in words is "one hundred sixty-five million, eight hundred twenty-five thousand, seven hundred ninety-seven".