165620105 has 8 divisors (see below), whose sum is σ = 227136192. Its totient is φ = 113568048.

The previous prime is 165620101. The next prime is 165620123. The reversal of 165620105 is 501026561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165620105 - 2² = 165620101 is a prime.

It is a super-2 number, since 2×165620105² = 54860038360422050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165620101) 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, 2365967 + ... + 2366036.

It is an arithmetic number, because the mean of its divisors is an integer number (28392024).

Almost surely, 2^165620105 is an apocalyptic number.

It is an amenable number.

165620105 is a deficient number, since it is larger than the sum of its proper divisors (61516087).

165620105 is an equidigital number, since it uses as much as digits as its factorization.

165620105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4732015.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 165620105 is about 12869.3474970567. The cubic root of 165620105 is about 549.1668984929.

Adding to 165620105 its reverse (501026561), we get a palindrome (666646666).

The spelling of 165620105 in words is "one hundred sixty-five million, six hundred twenty thousand, one hundred five".