165243078 has 160 divisors (see below), whose sum is σ = 497629440. Its totient is φ = 39579840.

The previous prime is 165243047. The next prime is 165243107. The reversal of 165243078 is 870342561.

165243078 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 161653 + ... + 162671.

It is an arithmetic number, because the mean of its divisors is an integer number (3110184).

Almost surely, 2^165243078 is an apocalyptic number.

165243078 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 165243078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (248814720).

165243078 is an abundant number, since it is smaller than the sum of its proper divisors (332386362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165243078 is a wasteful number, since it uses less digits than its factorization.

165243078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1055 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 165243078 is about 12854.6908947668. The cubic root of 165243078 is about 548.7498636543.

It can be divided in two parts, 1652430 and 78, that multiplied together give a triangular number (128889540 = T₁₆₀₅₅).

The spelling of 165243078 in words is "one hundred sixty-five million, two hundred forty-three thousand, seventy-eight".