165420443111 has 8 divisors (see below), whose sum is σ = 206238474624. Its totient is φ = 128899046520.

The previous prime is 165420443101. The next prime is 165420443143. The reversal of 165420443111 is 111344024561.

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

It is a cyclic number.

It is not a de Polignac number, because 165420443111 - 2⁶ = 165420443047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165420443101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1074158645 + ... + 1074158798.

It is an arithmetic number, because the mean of its divisors is an integer number (25779809328).

Almost surely, 2^165420443111 is an apocalyptic number.

165420443111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

165420443111 is a deficient number, since it is larger than the sum of its proper divisors (40818031513).

165420443111 is a wasteful number, since it uses less digits than its factorization.

165420443111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2148317461.

The product of its (nonzero) digits is 11520, while the sum is 32.

Adding to 165420443111 its reverse (111344024561), we get a palindrome (276764467672).

The spelling of 165420443111 in words is "one hundred sixty-five billion, four hundred twenty million, four hundred forty-three thousand, one hundred eleven".