165221542 has 8 divisors (see below), whose sum is σ = 248405976. Its totient is φ = 82419552.

The previous prime is 165221533. The next prime is 165221561. The reversal of 165221542 is 245122561.

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

It is a self number, because there is not a number n which added to its sum of digits gives 165221542.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94528 + ... + 96259.

It is an arithmetic number, because the mean of its divisors is an integer number (31050747).

Almost surely, 2^165221542 is an apocalyptic number.

165221542 is a deficient number, since it is larger than the sum of its proper divisors (83184434).

165221542 is a wasteful number, since it uses less digits than its factorization.

165221542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191222.

The product of its digits is 4800, while the sum is 28.

The square root of 165221542 is about 12853.8531966100. The cubic root of 165221542 is about 548.7260232397.

The spelling of 165221542 in words is "one hundred sixty-five million, two hundred twenty-one thousand, five hundred forty-two".