165670505 has 64 divisors (see below), whose sum is σ = 270950400. Its totient is φ = 93899520.

The previous prime is 165670501. The next prime is 165670537. The reversal of 165670505 is 505076561.

It is not a de Polignac number, because 165670505 - 2² = 165670501 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (165670501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 395186 + ... + 395604.

It is an arithmetic number, because the mean of its divisors is an integer number (4233600).

Almost surely, 2^165670505 is an apocalyptic number.

It is an amenable number.

165670505 is a deficient number, since it is larger than the sum of its proper divisors (105279895).

165670505 is a wasteful number, since it uses less digits than its factorization.

165670505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534.

The product of its (nonzero) digits is 31500, while the sum is 35.

The square root of 165670505 is about 12871.3054893433. The cubic root of 165670505 is about 549.2225986641. Note that the first 3 decimals are identical.

The spelling of 165670505 in words is "one hundred sixty-five million, six hundred seventy thousand, five hundred five".