165117440 has 40 divisors (see below), whose sum is σ = 395901000. Its totient is φ = 66045952.

The previous prime is 165117427. The next prime is 165117457. The reversal of 165117440 is 44711561.

165117440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29690 + ... + 34809.

It is an arithmetic number, because the mean of its divisors is an integer number (9897525).

Almost surely, 2^165117440 is an apocalyptic number.

165117440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165117440 is an abundant number, since it is smaller than the sum of its proper divisors (230783560).

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

165117440 is an frugal number, since it uses more digits than its factorization.

165117440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64522 (or 64506 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 165117440 is about 12849.8031113321. The cubic root of 165117440 is about 548.6107528027.

It can be divided in two parts, 1651 and 17440, that added together give a palindrome (19091).

The spelling of 165117440 in words is "one hundred sixty-five million, one hundred seventeen thousand, four hundred forty".