165125519 has 4 divisors (see below), whose sum is σ = 177827496. Its totient is φ = 152423544.

The previous prime is 165125509. The next prime is 165125537. The reversal of 165125519 is 915521561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 915521561 = 29 ⋅31569709.

It is not a de Polignac number, because 165125519 - 2¹² = 165121423 is a prime.

It is a super-2 number, since 2×165125519² = 54532874050038722, which 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 (165125509) 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, 6350969 + ... + 6350994.

It is an arithmetic number, because the mean of its divisors is an integer number (44456874).

Almost surely, 2^165125519 is an apocalyptic number.

165125519 is a deficient number, since it is larger than the sum of its proper divisors (12701977).

165125519 is a wasteful number, since it uses less digits than its factorization.

165125519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12701976.

The product of its digits is 13500, while the sum is 35.

The square root of 165125519 is about 12850.1174702802. The cubic root of 165125519 is about 548.6197002807.

The spelling of 165125519 in words is "one hundred sixty-five million, one hundred twenty-five thousand, five hundred nineteen".