165525394 has 4 divisors (see below), whose sum is σ = 248288094. Its totient is φ = 82762696.

The previous prime is 165525343. The next prime is 165525401. The reversal of 165525394 is 493525561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 493525561 = 79 ⋅6247159.

It can be written as a sum of positive squares in only one way, i.e., 162231169 + 3294225 = 12737^2 + 1815^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41381347 + ... + 41381350.

Almost surely, 2^165525394 is an apocalyptic number.

165525394 is a deficient number, since it is larger than the sum of its proper divisors (82762700).

165525394 is an equidigital number, since it uses as much as digits as its factorization.

165525394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82762699.

The product of its digits is 162000, while the sum is 40.

The square root of 165525394 is about 12865.6672582498. The cubic root of 165525394 is about 549.0621969054.

The spelling of 165525394 in words is "one hundred sixty-five million, five hundred twenty-five thousand, three hundred ninety-four".