165238780518 has 64 divisors (see below), whose sum is σ = 441741120000. Its totient is φ = 44726284512.

The previous prime is 165238780517. The next prime is 165238780571. The reversal of 165238780518 is 815087832561.

165238780518 is a `hidden beast` number, since 1 + 6 + 52 + 3 + 8 + 78 + 0 + 518 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165238780517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11496493 + ... + 11510856.

It is an arithmetic number, because the mean of its divisors is an integer number (6902205000).

Almost surely, 2^165238780518 is an apocalyptic number.

165238780518 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

165238780518 is an abundant number, since it is smaller than the sum of its proper divisors (276502339482).

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

165238780518 is a wasteful number, since it uses less digits than its factorization.

165238780518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23007386 (or 23007380 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 54.

The spelling of 165238780518 in words is "one hundred sixty-five billion, two hundred thirty-eight million, seven hundred eighty thousand, five hundred eighteen".