165970 has 16 divisors (see below), whose sum is σ = 341568. Its totient is φ = 56880.

The previous prime is 165961. The next prime is 165983. The reversal of 165970 is 79561.

165970 = T₁₆ + T₁₇ + ... + T₉₉.

It is a happy number.

It is an unprimeable number.

165970 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1116 + ... + 1255.

It is an arithmetic number, because the mean of its divisors is an integer number (21348).

2¹⁶⁵⁹⁷⁰ is an apocalyptic number.

165970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165970 is an abundant number, since it is smaller than the sum of its proper divisors (175598).

It is a weird number, because it is abundant, but not a pseudoperfect number.

165970 is a wasteful number, since it uses less digits than its factorization.

165970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2385.

The product of its (nonzero) digits is 1890, while the sum is 28.

The square root of 165970 is about 407.3941580337. The cubic root of 165970 is about 54.9553356396.

The spelling of 165970 in words is "one hundred sixty-five thousand, nine hundred seventy".