165601970 has 8 divisors (see below), whose sum is σ = 298083564. Its totient is φ = 66240784.

The previous prime is 165601963. The next prime is 165601999. The reversal of 165601970 is 79106561.

It can be written as a sum of positive squares in 2 ways, for example, as 163814401 + 1787569 = 12799^2 + 1337^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165601970.

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, 8280089 + ... + 8280108.

Almost surely, 2^165601970 is an apocalyptic number.

165601970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165601970 is a deficient number, since it is larger than the sum of its proper divisors (132481594).

165601970 is a wasteful number, since it uses less digits than its factorization.

165601970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16560204.

The product of its (nonzero) digits is 11340, while the sum is 35.

The square root of 165601970 is about 12868.6428965917. The cubic root of 165601970 is about 549.1468536132.

The spelling of 165601970 in words is "one hundred sixty-five million, six hundred one thousand, nine hundred seventy".