165211730 has 16 divisors (see below), whose sum is σ = 298491480. Its totient is φ = 65837952.

The previous prime is 165211727. The next prime is 165211757. The reversal of 165211730 is 37112561.

It can be written as a sum of positive squares in 4 ways, for example, as 76720081 + 88491649 = 8759^2 + 9407^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 165211730.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28019 + ... + 33398.

Almost surely, 2^165211730 is an apocalyptic number.

165211730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

165211730 is a deficient number, since it is larger than the sum of its proper divisors (133279750).

165211730 is a wasteful number, since it uses less digits than its factorization.

165211730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61693.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 165211730 is about 12853.4715155090. The cubic root of 165211730 is about 548.7151606401.

The spelling of 165211730 in words is "one hundred sixty-five million, two hundred eleven thousand, seven hundred thirty".