165566540 has 12 divisors (see below), whose sum is σ = 347689776. Its totient is φ = 66226608.

The previous prime is 165566509. The next prime is 165566543. The reversal of 165566540 is 45665561.

165566540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 165566494 and 165566503.

It is not an unprimeable number, because it can be changed into a prime (165566543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4139144 + ... + 4139183.

It is an arithmetic number, because the mean of its divisors is an integer number (28974148).

Almost surely, 2^165566540 is an apocalyptic number.

165566540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165566540 is an abundant number, since it is smaller than the sum of its proper divisors (182123236).

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

165566540 is a wasteful number, since it uses less digits than its factorization.

165566540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8278336 (or 8278334 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The square root of 165566540 is about 12867.2662209189. The cubic root of 165566540 is about 549.1076880954.

The spelling of 165566540 in words is "one hundred sixty-five million, five hundred sixty-six thousand, five hundred forty".