165240042320 has 40 divisors (see below), whose sum is σ = 384200312136. Its totient is φ = 66093055488.

The previous prime is 165240042311. The next prime is 165240042329. The reversal of 165240042320 is 23240042561.

It is an interprime number because it is at equal distance from previous prime (165240042311) and next prime (165240042329).

It can be written as a sum of positive squares in 4 ways, for example, as 50072117824 + 115167924496 = 223768^2 + 339364^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165240042329) 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, 2978354 + ... + 3033326.

Almost surely, 2^165240042320 is an apocalyptic number.

165240042320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165240042320 is an abundant number, since it is smaller than the sum of its proper divisors (218960269816).

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

165240042320 is a wasteful number, since it uses less digits than its factorization.

165240042320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92559 (or 92553 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 165240042320 its reverse (23240042561), we get a palindrome (188480084881).

The spelling of 165240042320 in words is "one hundred sixty-five billion, two hundred forty million, forty-two thousand, three hundred twenty".