165540542 has 4 divisors (see below), whose sum is σ = 248310816. Its totient is φ = 82770270.

The previous prime is 165540511. The next prime is 165540581. The reversal of 165540542 is 245045561.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 165540499 and 165540508.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41385134 + ... + 41385137.

It is an arithmetic number, because the mean of its divisors is an integer number (62077704).

Almost surely, 2^165540542 is an apocalyptic number.

165540542 is a deficient number, since it is larger than the sum of its proper divisors (82770274).

165540542 is an equidigital number, since it uses as much as digits as its factorization.

165540542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82770273.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 165540542 is about 12866.2559433582. The cubic root of 165540542 is about 549.0789454744.

The spelling of 165540542 in words is "one hundred sixty-five million, five hundred forty thousand, five hundred forty-two".