165978570 has 16 divisors (see below), whose sum is σ = 398348640. Its totient is φ = 44260944.

The previous prime is 165978539. The next prime is 165978583. The reversal of 165978570 is 75879561.

165978570 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon 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 7 ways as a sum of consecutive naturals, for example, 2766280 + ... + 2766339.

It is an arithmetic number, because the mean of its divisors is an integer number (24896790).

Almost surely, 2^165978570 is an apocalyptic number.

165978570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165978570 is an abundant number, since it is smaller than the sum of its proper divisors (232370070).

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

165978570 is a wasteful number, since it uses less digits than its factorization.

165978570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5532629.

The product of its (nonzero) digits is 529200, while the sum is 48.

The square root of 165978570 is about 12883.2670545945. The cubic root of 165978570 is about 549.5628151163.

Subtracting from 165978570 its reverse (75879561), we obtain a palindrome (90099009).

The spelling of 165978570 in words is "one hundred sixty-five million, nine hundred seventy-eight thousand, five hundred seventy".